Aberdeen manager Stephen Glass tells BBC Scotland: "We allowed Raith to create an atmosphere with the way they started the second half and the response from the group isn't what it should have been, the quality wasn't what it should have been, and we've paid a heavy, heavy price for it.

"It's a massive disappointment we're not in the next round. The group that were on the pitch in the first half showed they were good enough to win and control the game. The reaction to the adversity that came and the cup tie atmosphere that started happening wasn't good enough.

"You get what you deserve at the end of the day and the second half performance we got what we deserved."

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Ali McCann is the next St Johnstone player to have a go and his powerful shot is pushed over the top by Derek Gaston.

A delighted Raith Rovers manager John McGlynn tells BBC Sportsound: "It was a brilliant cup win and I am delighted the fans were here to see it.

"We got back into the game through Ethon Varian and it was a really well-taken goal. Then we got the winner. We were well in the game and anything can happen.

"We put a bit of pressure on Aberdeen. I am delighted for the guys today. We showed composure. I'll crack a bottle of champagne, possibly."

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Odsonne Edouard returns to the Celtic starting line-up after beginning the last three matches on the bench.

The French striker - subject of intense transfer speculation with his contract into its final year - replaces Ryan Christie, who drops out of the squad altogether.

New midfield arrival James McCarthy is among the substitutes and could make his debut this afternoon.

Hearts replace winger Josh Ginnelly with Stephen Kingsley returning.

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The visitors threaten as Glenn Middleton finds his way into the box but his shot is tipped round the post.

Hibernian goalkeeper Matt Macey has to pull out a big stop to deny Kilmarnock's Scott Robinson, who was clean through on goal as the home defence was caught out by a ball over the top.

Celtic: Hart, Ralston, Starfelt, Welsh, Taylor, McGregor, Turnbull, Rogic, Forrest, Furuhashi, Edouard.

Substitutes: Bain, Bitton, Griffiths, Ajeti, Soro, Shaw, McCarthy, Urhoghide, Montgomery.

Hearts: Gordon, M Smith, Kingsley, Souttar, Halkett, Halliday, Haring, Baningime, Cochrane, Mackay-Steven, Boyce.

Substitutes: Stewart, Walker, McEneff, Henderson, C Smith, Ginnelly, Denholm.

Martin Boyle goes close to adding to his recent impressive run in front of goal, but the sliding Hibs winger can't connect with Jamie Murphy's dangerous ball across the box.

There was late team change for Arbroath, with captain Thomas O’Brien starting and Liam Henderson dropping out.

Willie Miller
Former Aberdeen captain on BBC Sportsound

We're under way at Gayfield and Easter Road. Is there another upset afoot?

Hibs' excellent start to the campaign came to a shuddering halt in the heat of Croatia on Thursday when they were dumped 4-1 by Rijeka to crash out of Europa Conference League qualifying.

Skipper Paul Hanlon missed that one with concussion and he's out again, while striker Christian Doidge is now a long-term absentee, which has put a dampner on things.

Hibs beat relegated Kilmarnock in all three meetings last season but Tommy Wright has completely overhauled the squad at Rugby Park and the visitors will want to prove this is the level they belong at.

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Cup holders St Johnstone begin their defence away to Arbroath in just a jiffy.

Gayfield will be quite the contrast to a packed McDiarmid Park on Thursday when Saints' Europa League hopes were dashed by Turkish giants Galatasaray.

Arbroath's style may also be rather different and you can be sure Dick Campbell's Championship will be right up for this one.

A much-changed St Johnstone team will need to have their wits about them.

Rovers have done it!

The Fifers are into the quarter-finals for the first time since 1994 - when they famously went on to lift the League Cup.

Aberdeen controlled much of the first half and led thanks to a sweet Jay Emmanuel-Thomas strike.

However, the Championship side came storming back with goals from Ethon Varian and Dario Zanatta to cause a major upset.

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Nearly there for Rovers... Aberdeen can't get a hold of the ball.

And now they are down to nine, with Ryan Hedges in a heap by the side of the pitch.

Jonny Hayes is being wheeled away on chair and has a protective moonboot thing on. If the Dons are to salvage this, they'll need to do it a man down.

Into five minutes of stoppage time we go...

Jonny Hayes gets plenty on his shot from the edge of the box but Raith Rovers players are putting their bodies on the line and a defender in blue makes the block.

Hayes then has to hop off for some attention, which means Aberdeen are temporarily down to 10 men.

The home fans are roaring with approval as Rovers do a grand job of maintaining possession.

Fresh legs for the Fifers as Matej Poplatnik and Aaron Arnott come on for the final 10 minutes or so.