And both games are off and running.

Here we go...

Just in case anyone is wondering, it's very much not disco light time at Tannadice.

It's currently disco light time at Parkhead...

Hibernian manager Jack Ross tells Premier Sports: "Our record in the cups over the last few years has been good without going that final step and winning it.

"The consistency we've shown in cup competitions is very good. The ambitions for everyone at the club is to win silverware."

Dundee United manager Thomas Courts, who has made four changes for tonight's tie, tells Premier Sports: "When I came in here I wanted to progress in the cups. We made the Scottish Cup semi-final last year and we want to do the same again but this time with fans there. It's a big carrot for us.

"The key thing for us is to use the full squad. It's a good chance to freshen up and show that we trust the squad."

Who do you think will be making it into the semi-finals with Rangers and St Johnstone? Are we heading for extra time anywhere? What are you having for your dinner?

Get in touch as we move to within 10 minutes of kick-off.

Raith Rovers boss John McGlynn tells BBC Sportsound: "We've picked the same team that beat Aberdeen, we'll need a similar performance from them tonight.

"We'll need our substitutes as well. Celtic will come out the blocks and try score an early goal or two. We need to try stay in the game and frustrate them.

"Hopefully we get the chance to pass the ball, but it's a challenge and a test for us to do be able to do that."

Celtic: Hart, Ralston, Carter-Vickers, Starfelt, Montgomery, McCarthy, Turnbull, Abada, Rogic, Jota, Ajeti.

Substitutes: Bain, Scales, Bitton, Giakoumakis, Soro, Bolingoli, Urhoghide, Welsh, Juranovic.

Raith Rovers: MacDonald, Tumilty, Benedictus, Berra, Dick, Riley-Snow, Connolly, Zanatta, Tait, Matthews, Varian.

Substitutes: Thomson, Lang, Spencer, McKay, Arnott, Mitchell, Young, Poplatnik

Dundee United manager Thomas Courts makes four changes from the 1-0 win over Dundee at the weekend.

Goalkeeper Trevor Carson is back in the starting line-up, with Nicky Clark, Dylan Levitt and Kieran Freeman all coming into the starting line-up.

Benjamin Siegrist and Ilmari Niskanen drop to the bench, but Kerr Smith and Calum Butcher drop out of the squad.

Celtic boss Ange Postecoglou tells BBC Sportsound "it's important tonight we get off to a quick start and play our football".

On his team selection, he adds: "Carl [Starfelt] wasn't well at the weekend and he's available now and we are giving Anthony [Ralston] a bit more game time.

"We can't make too many changes anywhere else because we have a limit squad."

The Australian also confirms Greek striker Georgios Giakoumakis will get some game time off the bench tonight.

Celtic boss Ange Postecoglou has made three changes to the side that suffered a third league defeat of the season at Livingston on Sunday.

All the switches are in defence, as Josip Juranovic, Stephen Welsh and Boli Bolingoli make way for Anthony Ralston, Carl Starfelt and Adam Montgomery.

As for Raith Rovers, it's just one change as Brad Spencer is out. Aidan Connolly comes in for the midfielder.

Rangers overpowered Livingston after the break to secure serene progress to the Scottish League Cup semi-finals.

Half-time substitute Ianis Hagi made an instant impression, setting up Kemar Roofe's close-range opener.

Max Stryjek spared Livingston from a hammering with several saves, but blotted his excellent performance by passing straight to Alfredo Morelos, who put the game beyond the visitors.

Image source, SNS

League Cup holders St Johnstone progressed to a third straight semi-final as Shaun Rooney and Ali Crawford netted after the break to earn a last-eight win at Dundee.

In an evenly-contested Tayside tie, Rooney - who scored winning headers in both domestic cup finals last term - steered in on 70 minutes before Crawford added a second late on.

It means Callum Davidson's side, who will find out their semi-final opponent on Thursday, will play at Hampden for a fifth time in less than a year.

Image source, SNS

Scott Allan makes his first start for Hibernian since July as Jack Ross makes two changes from the weekend 2-2 draw with St Mirren.

The midfielder has made a number of substitute appearances since then but starts tonight ahead of Chris Cadden.

Easter Road stalwart Lewis Stevenson also makes his first start since the beginning of August, filling in at left back ahead of Josh Doig.

Image source, SNS

Dundee United: Carson, Mulgrew, Edwards, Levitt, Freeman, Harkes, McMann, Fuchs, Pawlett, Clark, McNulty

Substitutes: Siegrist, Sporle, Reynolds, Niskanen, Chalmers, Hoti, Mochrie, Appere, K Smith

Hibernian: Macey, McGinn, Porteous, Hanlon, Stevenson, Doyle-Hayes, Newell, Magennis, Allan, Boyle, Nisbet

Substitutes: Dabrowski, Cadden, McGregor, Doig, Gullan, Gogic, Scott, MacKay, Wood

Hello and welcome to round two of Scottish League Cup quarter-final action.

Rangers and holders St Johnstone are already in the hat for the semi-finals, who will join them?

Team news from Celtic Park and Tannadice coming up shortly

Image source, SNS