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Albion Rovers 0-1 Celtic
The League One side certainly haven't altered their game plan since going behind as they continue to string defenders across the edge of their own box. Get to half time at 1-0 will be the message.
FT: Albion Rovers 0-3 Celtic
Scott Sinclair scores stunning opener
Moussa Dembele adds second, Armstrong with the third
FT: Raith Rovers 1-1 Hearts
Jamie Walker gives Hearts the lead
Declan McManus heads late equaliser
Colin Moffat
Albion Rovers 0-1 Celtic
The League One side certainly haven't altered their game plan since going behind as they continue to string defenders across the edge of their own box. Get to half time at 1-0 will be the message.
Raith Rovers manager Gary Locke
"I felt we probably should have won the game. In the second half especially we were on the front foot a lot. We've had a wee blip in the last few games but there's a lot of quality in the dressing room so I'm delighted their efforts today got rewarded and on another day if we had taken our chances we could have won the game.
"I didn't just put Rudi (Skacel) on the pitch for sentiment, he's always a threat in and around the box. It was a great strike from him and Dec (McManus) has done great to get in front of the goalkeeper and nod it into the net."
Scott Sinclair
That is a peach! Scott Sinclair gathers the ball on the left edge of the penalty box, looks up, and sends a dipping, curling shot into the opposite top corner. Unstoppable.
Albion Rovers 0-0 Celtic
Richard Wilson
BBC Scotland at Excelsior Stadium
The visitors are dominating possession, but the depth and width of Albion's defence means that there is little space to exploit in the final third. Celtic are trying to pick their way through the crowded ranks of Albion players, but it may take time to work a scoring opportunity. Dembele has looked threatening, though, and the movement of Sinclair and Forrest has provided moments of optimism for Celtic.
Hearts head coach Ian Cathro
When asked was Raith Rovers' late equaliser difficult to take, Hearts head coach Ian Cathro said: "It's okay. What's difficult, we've just to beat them again.
"I've just been informed we have to play the replay in midweek so we have to deal with it then.
"We were okay in the game, we could have played better but there's no need for an over-reaction. We don't have any doubts in our work, we just need to keep working."
Albion Rovers 0-0 Celtic
Celtic work their way in behind the packed Rovers defence but Scott Sinclair can't squeeze his angled shot beyond goalkeeper Ross Stewart.
Albion Rovers 0-0 Celtic
Rod Stewart looks in high spirits as he arrives in Airdrie. He's helping with the fifth round draw at full-time but appears to think he might have a commentary gig with that John Motson tribute coat.
Albion Rovers 0-0 Celtic
The League One part-timers continue to stand firm on the artificial turf, with Celtic left-back Kieran Tierney the latest player to slip on the surface.
Albion Rovers 0-0 Celtic
Intricate play between Moussa Dembele and Scott Sinclair on the edge of the Rovers box but the ball just runs away from the latter, allowing Ross Stewart to smother.
Albion Rovers 0-0 Celtic
Celtic striker Moussa Dembele meets a long diagonal cross from Mikael Lustig and leaps above Rovers defender Ross Dunlop, with his looping header just a fraction too high.
Albion Rovers 0-0 Celtic
Albion Rovers are seeking only their third victory over Celtic in 27 meetings, their first coming in 1920 and their last being a 2-1 home win in the old top-flight back in 1934.
Jim Renwick scored twice for the Wee Rovers that day.
Albion Rovers 0-0 Celtic
Celtic are stepping it up now as Stuart Armstrong curls a strike on target from 20 yards but it's central and an easy enough tip over for goalie Ross Stewart.
Albion Rovers 0-0 Celtic
When Nir Bitton scores, it's usually a screamer. The Celtic midfielder lets fly from 30 yards or so but his shot whistles a few feet over the top.
Albion Rovers 0-0 Celtic
Celtic are probing away patiently, popping first time passes around, with Albion Rovers packing men behind the ball. All quiet so far.
Albion Rovers 0-0 Celtic
Albion Rovers have four players called Ross in their line-up to face Celtic - including two called Ross C Stewart - and another on the bench.
Former Motherwell goalkeeper Ross Stewart is expected to be the busier of the two, with his namesake, who arrived at Cliftonhill from Kilwinning Rangers last summer, being a striker.
Ross Dunlop partners brother Michael in central defence, former Kilmarnock midfielder Ross Davidson also starts, while right-back Ross Gilmour is a substitute.
The introduction of Ross Stewart up front is the only change from the Rovers side that beat Brechin City 1-0 last time out, with Connor Shields dropping to the bench.
Albion Rovers 0-0 Celtic
Rovers might think their best bet is to steal something from a set-piece since they have a few big lads. Their first free-kick is dealt with comfortably by Celtic keeper Craig Gordon.
Albion Rovers 0-0 Celtic
Albion Rovers switched the tie to the home of neighbours Airdrieonians to ensure a bigger payday as Cliftonhill Stadium only has a capacity of 1,238.
Excelsior Stadium can hold 10,000, which will go some way to ensuring financial stability for the Coatbridge part-timers.
The stadium proved a happy hunting ground for the Wee Rovers already this year, beating their full-time hosts 2-1 in their New Year fixture there in League One.
Darren Young's side already have one Premiership scalp this season, beating Kilmarnock in the League Cup at Rugby Park in June, but they will still be doing well to record a third victory on the bounce.
Albion Rovers 0-0 Celtic
No time to dwell on events in Fife, since we are under way at the Excelsior Stadium.
@bbcsportscot
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The teams will meet again at Tynecastle next Wednesday after that dramatic late equaliser from Declan McManus. Mark Stewart will be a relieved man after his incredible miss.
You can't say the Championship didn't deserve it, since they bossed the second half.