Celtic midfielder Tom Rogic is booked for simulation after going down following Jim Goodwin's challenge in the box.

Celtic captain Scott Brown heads wide from a corner.

Alloa are caught on the break following a corner and Moussa Dembele is clean through in the box but goalkeeper Neil Parry gets out quickly to make the block.

Alloa continue to frustrate Celtic. The visitors' closing down is limiting the hosts.

Celtic do carve out a chance for Scott Sinclair, but he gets under it and shoots high over the crossbar.

Substitute Scott Sinclair is making a difference already, the Celtic winger cutting in from the left and firing narrowly wide.

Second half underway.

Scott Sinclair - the scorer of six goals for Celtic so far this season - is coming on for the second half to replace Patrick Roberts.

Image source, SNS

Part-timers Alloa go into the second 45 minutes still in with a chance of a major shock and are going some way to proving the point wanted by striker Greig Spence.

"There are boys who were in the same youth team as me who are playing every week for Celtic - and, if I'm perfectly honest, they're not a million miles better than me," he told league sponsor Ladbrokes earlier this week. 

"Players get the breaks, but there's not that big a difference between the boys who break through and those who get released." 

Celtic have looked a class apart in everything but finishing, but Spence, who was sold by Alloa to Celtic for £100,000 in 2009, has threatened a couple of times to score his 10th goal in his 13th appearance this season.

He is not the only Celtic old boy in the black and gold hoops. Veteran midfielder Jim Goodwin, left-back Calum Waters and substitute central defender Jason Marr all started their careers with the Glasgow club.

Image source, SNS

No goals in the first half in Glasgow. Alloa have not looked overawed and threatened a little towards the end of the opening period. Celtic have huffed and puffed but the end product has been poor and goalkeeper Craig Gordon was perhaps fortunate to escape a red card.

Image source, SNS

An Alloa free-kick from Calum Waters finds the stretching Ben Gordon, but his header is held by Craig Gordon.

Allan Preston
BBC Scotland summariser at Celtic Park

Celtic goalkeeper Craig Gordon races off his line to close down Greig Spence and takes out the Alloa forward. It's a booking for Gordon, it could have been a dismissal.

Best chance so far. James Forrest is found inside the penalty area and the winger elects to shoot with the outside of his right foot but is off target. He might have been better hitting that with the left.

Tom Rogic has had a few shots at goal so far for Celtic and his latest is well over. The Australian midfielder looks a bit frustrated with how this first half is going.

Kieran Tierney fired against the crossbar at Inverness on Sunday and the left-back does so again, rattling the Alloa goal from the left-hand side.

After a decent spell for Alloa, Celtic go back on the attack but neither Moussa Dembele nor James Forrest can convert as defenders and goalkeeper Neil Parry make themselves obstacles.