Derek Adams makes two changes to the Ross County side which drew at Livingston in midweek.

George Harmon and Jordan White start, with Victor Loturi and Brandon Khela dropping to the bench.

St Johnstone make three changes after their draw with Motherwell seven days ago.

Key defender Liam Gordon is missing from the matchday squad after picking up an injury against the Steelmen, with Tony Gallacher taking his place.

Teenager Fran Franczak wins a start ahead of Dan Phillips.

And Connor Smith makes his debut after signing on loan from Hearts.

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Matt O'Riley's corner is cleared but Aberdeen cannot mount an effective counter.

The ball keeps coming back in the direction of the Aberdeen box.

Celtic have a corner with more than four minutes of added time to play. Aberdeen have started to tire.

Six minutes of added time start at Pittodrie.

Dundee manager Tony Docherty says his team have taken on board what went wrong 11 days ago when they lost 3-2 at Tynecastle, having been 2-0 up at half time.

"We've already beat them at home 1-0 earlier this season," Docherty told BBC Scotland.

"They're a very good team Hearts, they're not so far clear in third for no reason. We realise there's a lot of things we need to do right. It'll be two good teams going for it.

"In terms of structure behind the ball, we need to be more concentrated. We've got a lot of young players, and we did learn. After that the performance against Livingston was full of mentality and spirit. So we need to carry that on."

Motherwell name an unchanged starting XI, despite a raft of signings in the final throes of the transfer window. They are all on the bench - Sam Nicholson, Jili Buyabu, Jack Vale and Adam Devine.

Kilmarnock's marquee signing - and a man Motherwell know well - is also on the bench. Kevin van Veen was at the centre of a Premiership tug-of-war, but plucked for Killie in the end.

There are three changes, though. Will Dennis recovers from injury to take the gloves back from Kieran O'Hara, while Tom Davies comes in for the suspended Corrie Ndaba. It's Davies' first start since September.

Liam Polworth replaces Rory McKenzie in midfield.

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Pat Bonner
Former Celtic goalkeeper on BBC Sportsound

Celtic are desperate for a winner. They're always capable of a late goal.

Rocco Vata is coming on for Celtic. Luis Palma's race is run.

Ross County: Wickens, Harmon, Ayina, Nightingale, Borthwick-Jackson, Brown, Jenks, King, Dhanda, Murray, White.

Substitutes: Ross, Sims, Sheaf, Loturi, Henderson, Khela, Efete, Brophy, Reid.

St Johnstone: Mitov, Gallacher, Considine, McGowan, Robinson, Keltjens, Carey, Kucheriavyi, Franczak, C Smith, Kimpioka.

Substitutes: May, Kane, Clark, Jaiyesimi, Sidibeh, Olufunwa, Sprangler, Richards, K Smith.

Leighton Clarkson sends through a defence-splitting pass and Bojan Miovski skips past Joe Hart to net but the Aberdeen striker is correctly ruled offside. The linesmen have had a busy afternoon so far.

These were the two celebration moments so far at Pittodrie. Will there be another as time ticks away?

Image source, SNS

Image source, SNS

And Alistair Johnston is able to continue and there will likely be some added time at Pittodrie.

Slight delay to proceedings as Celtic's Alistair Johnston receives treatment on a knock.

Ten minutes of regulation time to play.

Nick Montgomery makes three changes from last weekend's draw versus Kilmarnock, with a debut handed out to one of Hibs' three deadline day arrival.

As expected, Sunderland loanee Nectarios Triantis fills in for veteran centre-back Paul Hanlon - who remains out through illness.

Myziane Maolida starts following his late leveller last Saturday at Rugby Park, while Rory Whittaker replaces fellow youngster Kanayo Megwa at right-back.

There is just the one change for St Mirren, as Caolan Boyd-Munce replaces captain Mark O'Hara in midfield.

In attack, there is a first start for Exeter City loanee James Scott following his involvement off the bench last Saturday.

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With Aberdeen travelling to Ibrox midweek, Philippe Clement makes six changes to the Rangers side that saw off St Mirren last time out.

Borna Barisic, Leon Balogun, Ryan Jack, Ross McCausland, Fabio Silva and Rabbi Matondo are all drafted in, with Ridvan Yilmaz, John Souttar, Nicolas Raskin, Dujon Sterling, Scott Wright and Cyriel Dessers all dropping out.

Deadline day signing Oscar Cortes is only on the bench after moving to Glasgow on loan from Lens.

There's four switches for David Martindale's Livingston, who twice came from behind to draw with Ross County on Wednesday.

Michael McGovern, Michael Nottingham, Steven Bradley and Kurtis Guthrie make way for Shamal George, Shaun Donnellan, Mo Sangare and debutant David Carson.

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Dante Polvara comes off for Aberdeen as Luis 'Duk' Lopes comes on, from here on in referred to Duk.

Celtic have also made a substitution. Stephen Welsh takes Maik Nawrocki's place in defence after a difficult second half for the Polish centre-half.

Here's how Nicolas Kuhn got Celtic level.

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It's set up for a fascinating finale.

Some nice touches from new Celtic forward Adam Idah as he sets up an attack on the left but Aberdeen eventually clear their lines.

Both sides are about to make changes...

Pat Bonner
Former Celtic goalkeeper on BBC Sportsound

Joe Hart read that situation. What a big save from the goalkeeper.