St Mirren assistant manager Brian Kerr has been promoted after Diarmuid O'Carroll left the club to join Newcastle United and today faces his old team.

"Delighted to be back in the dugout," the new number two told BBC Scotland.

"The club is in a good place, hopefully I can contribute to that.

"It's always a tough game against Motherwell. The league position tells you that. We've started well, they've started well. It should be a good spectacle for everybody here today.

"We're back in the top six now which is where we want to be for most of this season. Hopefully it's now time to kick on.

"It was business as usual for us this week, preparation as exactly the same as it always is. The boys are in good spirits and that's the most important thing.

"We've come to the game ready and prepared and hopefully we come away with three points today."

Dundee manager Tony Docherty tells BBC Scotland that the club are mourning the loss of "brilliant servant" and "wonderful character" Fabian Caballero.

"I was really shocked to hear that news this morning. A complete surprise to everyone. He was here last year at Cammy Kerr's testimonial. Such a popular figure, quite rightly as he was a fantastic footballer for Dundee. And a brilliant servant.

"The Dundee family is mourning his loss and pay all respects to his family. Hopefully we can put on a performance befitting of that player.

"He was part of a fantastic team and he left a mark which is clear in the reaction. I was at Dundee United at the time - and I don't think we won a derby in that time. Caballero was a thorn in the flesh.

"From everything I hear about him too, clearly a wonderful character."

Prior to kick-off, there will be a minute of applause in memory of former Dundee striker Fabian Caballero, who has died at the age of just 46.

The Paraguayan will be fondly remembered by fans of the Dark Blues after five seasons at the club in the early 2000s.

A class act in the number seven shirt, usually with his socks rolled down around his ankles.

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St Mirren striker Toyosi Olusanya has scored in each of his last three Premiership games.

The last player to score in four straight top-flight outings for the Buddies was Andy Dorman in April 2009.

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Aberdeen manager Jimmy Thelin is not aware of how serious Premiership top scorer Pape Habib Gueye's injury is.

"He unfortunately picked up an injury," the Dons boss told BBC Scotland.

"We are waiting for an assessment from the experts. We expect a clear answer by Monday.

"He has been really good and an important player for the team. The most important thing is that he gets back fit and healthy. We have to find solutions now."

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This is not what Hearts fans want to see. Interim boss Liam Fox indicated yesterday that Gerald Taylor faced an extended period out with a knee injury and he is on crutches today, although he doesn't look too down about it.

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Liam Fox makes five changes to the Hearts line-up in his first match in interim charge following Steven Naismith's departure.

A new-look defence comprises Adam Forrester, Frankie Kent and Kye Rowles alongside Stephen Kingsley, who is the only survivor from last week's back four.

In midfield, Cammy Devlin takes over from Malachi Boateng while Alan Forrest replaces Blair Spittal.

Fox's team looks like a 4-3-3 with Forrest and Kenneth Vargas either side of captain Lawrence Shankland as the hosts look to arrest an 11-match winless streak that stretches back to May and includes eight successive defeats.

Just one change for Ross County following last week's draw with St Johnstone. Michee Efete replaces James Brown in midfield.

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Derek McInnes swaps two from the draw with St Mirren a fortnight ago. Joe Wright is suspended and replaced by Lewis Mayo in a like-for-like swap at the back.

Brad Lyons returns from his own suspension to take the place of David Watson in midfield.

Jim Goodwin has been quite settled in his selections so far this season but also makes two changes.

Jort van der Sande is dropped to the bench, with Kristijan Trapanovski missing out completely. Louis Moult and Sam Dalby come in, with the latter making his first start for the club.

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Goalkeeper Jon McCracken, full-back Ethan Ingram and centre-back Clark Robertson return for Dundee following last weekend's League Cup quarter-final defeat to Rangers.

Trevor Carson and Oluwaseun Adewumi drop to the bench for the hosts, while defender Jordan McGhee misses out entirely with a calf injury.

There's a shock amongst the visitors' changes as Pape Habib Gueye, who has five goals in five league appearances this season, is missing. The in-form Aberdeen striker is replaced by Finnish winger Topi Keskinen.

Club captain Graeme Shinnie returns following the Dons' League Cup quarter-final victory over Spartans - a move which ousts Ante Palaversa.

Returning to the Dons' match day squad is previously AWOL forward Duk, who has not played for the club since 19 May.

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It's round one in the Scottish Cup this weekend, with an absolute bonanza of fixtures up and down the country.

Hill Of Beath Hawthorn and Broxburn Athletic are already into round two after wins last night.

You can check the scores here across the afternoon.

Raith Rovers v Falkirk looks like the pick of the bunch in the Championship.

The visitors have won five from five, while last season's runners-up have struggled so far and sit second bottom.

Top-of-the-table Ayr United host Morton, buoyed by the news Scott Brown is staying on as manager, having been courted by St Johnstone.

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Motherwell: Oxborough, O'Donnell, Casey, Gordon, McGinn, Wilson, Zdravkovski, Halliday, Miller, Ebiye, Robinson.

Substitutes: Heygi, Seddon, Balmer, Sparrow, Stamatelopoulos, Kaleta, Maswanhise, Watt, Tavares.

St Mirren: Balcombe, Bwomono, Fraser, Gogic, Taylor, Tanser, Boyd-Munce, O'Hara, Phillips, Mandron, Olusanya.

Substitutes: Urminsky, Dunne, Brown, Smyth, Idowu, Kiltie, Scott, Ayunga, Van Veen.

Kilmarnock: O'Hara, Burroughs, Mayo, Findlay, Ndaba, Armstrong, Lyons, Polworth, Kennedy, Vassell, Watkins.

Substitutes: McCrorie, Deas, McKenzie, Watson, Murray, Anderson, Donnelly, Wales, Bainbridge.

Dundee United: Walton, Adegboyega, Gallagher, Graham, Stephenson, Docherty, Sibbald, Ferry, Babunski, Moult, Dalby.

Substitutes: Richards, Holt, Sevelj, Odada, Middleton, Fotheringham, Van der Sande, Thomson, Obuchioma.

Hearts: Gordon, Forrester, Kent, Rowles, Kingsley, Grant, Baningime, Devlin, Forrest, Shankland, Vargas.

Substitutes: Clark, Halkett, Oyegoke, McKay, Spittal, Dhanda, Tait, Boyce, Penrice.

Ross County: Laidlaw, Campbell, Wright, Efete, Lopata, Leak, Randall, Chilvers, Nisbet, Hale, White.

Substitutes: Hamilton, Brown, Loturi, Grieves, Telfer, Samuel, Brophy, Smith, Nightingale.

Dundee: McCracken, Ingram, Portales, C Robertson, Koumetio, Larkeche, Braybrooke, Sylla, Cameron, Murray, Tiffoney.

Substitutes: Carson, Astley, Mulligan, Main, Adewumi, F Robertson, Palmer-Houlden, Fraser, Vetro.

Aberdeen: Mitov, Devlin, Rubezic, Molloy, MacKenzie, Heltne Nilsen, Shinnie, McGrath, Clarkson, Keskinen, Nisbet.

Substitutes: Doohan, Duk, Besuijen, Palaversa, Sokler, Morris, Milne, MacDonald, Ambrose.

Aberdeen and Celtic are looking to maintain 100% records in the Scottish Premiership, while Hearts and St Johnstone are searching for new managers.

Hearts are also seeking a first win, along with Kilmarnock.

We've got four games coming up in an hour, with an early evening kick-off in Perth.

Top flight team news coming right up...

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