Scales nets fine 20-yard strike via post, Giakmoukais converts Jota's cross in second half
Maeda heads in from a yard out then Bitton bundles home rebound after seeing penalty saved
Jullien makes comeback from 13-month injury lay-off
Hibs fought back to beat Arbroath 3-1 earlier
Draw for quarter-finals takes place after final fifth-round tie - Peterhead v Dundee (19:45 GMT) - on Monday
Celtic 3-0 Raith Rovers
A big moment for Christopher Jullien.
The French centre-half has been waiting on the bench for a couple of games to end a 13-month spell on the sidelines through injury.
Now Jullien makes his long-awaited return.
Daizen Maeda
A quick one-two and Rovers are well and truly floored.
Celtic manager Ange Postecoglou was about to make a triple change before that goal, changed his mind about bringing on captain Callum McGregor, and one of the substitutes immediately makes his mark.
Anthony Ralston is unmarked as he rises to head on a corner and striker Daizen Maeda has his first header superbly saved by goalkeeper Jamie MacDonald but nods his second over the line.
Image source, BBC SportGiorgos Giakoumakis
Frustration relieved...
Jota beats Reghan Tumilty to a ball played behind the Rovers defence and, when the Portuguese winger rolls his low cross into the penalty box, Giorgos Giakoumakis is on hand to side-foot past goalkeeper Jamie MacDonald.
Image source, BBC SportCeltic 1-0 Raith Rovers
Celtic's frustration continues and Jota's ambitious 25-yard drive is a straightforward save for goalkeeper Jamie MacDonald.
Celtic 1-0 Raith Rovers
Rovers boss John McGlynn makes two attacking changes as he fancies a shock comeback.
On-loan Livingston striker Matej Poplatnik replaces Jamie Gullan, while Aidan Connolly's place in midfield is taken by on-loan Stoke City forward Ethon Varian.
Celtic 1-0 Raith Rovers
Pat Bonner
Former Celtic goalkeeper on BBC Sportsound
Quote MessageWhat I like about Raith Rovers is they all have a wee turn of pace. Championship players, you wouldn't maybe expect them to have that
Celtic 1-0 Raith Rovers
Rovers right-back Reghan Tumilty flashes a cross across the face of the Celtic goal.
Goalkeeper Joe Hart decides he can't come out to collect and the home support are sent into a nervous hush as it evades visiting striker Dario Zanatta at the back post.
Celtic 1-0 Raith Rovers
James Forrest weaves in and out of forest of legs, but the Celtic winger can't fashion a sight at goal and another home move comes to nothing.
Celtic 1-0 Raith Rovers
Rovers bring Celtic goalkeeper Joe Hart into some action.
Former Hibs striker Jamie Gullan tries a snap shot, but the visitors' first effort on target is easily held.
Celtic 1-0 Raith Rovers
Rovers are putting bodies on the line inside their own penalty box as they make a series of important blocks.
The action leaves Mikey Johnston hobbling and the injury-plagued forward looks in some distress as he heads down the tunnel to be replaced with on-loan Benfica winger Jota.
Celtic 1-0 Raith Rovers
What a miss!
Giorgos Giakoumakis fires against the crossbar from five yards and the Greek striker will be relieved that the offside flag goes up against Mikey Johnston before the forward's low cross.
Celtic 1-0 Raith Rovers
Craig Levein
Former Scotland manager on BBC Sportsound
Quote MessageThat was excellent from Raith Rovers. They really got after Celtic and Celtic were quite fortunate there
Celtic 1-0 Raith Rovers
Rovers are looking more positive after the break and the home side are saved by a couple of desperate, last-ditch headers from centre-half Stephen Welsh then right-back Anthony Ralston gets himself in a muddle before hacking clear from his own six-yard box.
Celtic 1-0 Raith Rovers
Rovers get the second half under way.
Can the Fifers fight back to cause a major Scottish Cup shock?
HT: Celtic 1-0 Rangers
A positive change at half-time by Rovers, as striker Dario Zanatta is sent on in place of on-loan Rangers midfielder Ben Williamson.
Zanatta was sent off in Rovers' League Cup defeat at Celtic Park in September and will hope for better today.
HT: Celtic 1-0 Raith Rovers
Dundee United, Hearts, Hibs, Motherwell, Rangers and St Mirren are already into the Scottish Cup quarter-finals.
Celtic seemed certain to join them on the basis of form and home advantage, but it is no foregone conclusion just yet.
HT: Celtic 1-0 Raith Rovers
Craig Levein
Former Scotland manager on BBC Sportsound
Quote MessageIf you look at it again, it is a definite penalty and Raith Rovers have been excellent. They are playing a reasonably high line, but it has worked for them so far. They might struggle later on through tiredness though
HT: Celtic 1-0 Raith Rovers
Pat Bonner
Former Celtic goalkeeper on BBC Sportsound
Quote MessageCeltic's tempo has not been as good as it has been, but that is down to Raith Rovers also. They are not allowing Celtic to play through the lines and I think they've done very well and the big talking point will be the hand ball from their perspective
The half-time whistle goes to muted applause from the home support.
Celtic are ahead as expected, but they will have hoped for more than a single Liam Scales strike to separate them from the Championship visitors.
Rovers had a good shout for a penalty denied by referee Steven McLean after the ball struck Cameron Carter-Vickers.
Image source, SNSLiam Scales' goal gave Celtic an early lead
Celtic 1-0 Raith Rovers
We're into two minutes of first-half stoppage time and Celtic have failed to build on that early lead.