Weah concludes flowing Celtic move to seal points
Forrest jabs in Weah cross to score, then limps off with hamstring injury
Ajer dismissed after receiving second yellow card as Celtic finish with nine
St Johnstone's Clark makes series of fine saves
Substitute Edouard off injured within eight minutes
Toljan on for Lustig at break to make Celtic debut
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St Johnstone 0-1 Celtic
Pat Bonner
Former Celtic goalkeeper on BBC Sportsound
Quote MessageReally alert from James Forrest. Lovely ball dinked across the face of goal. He really shouldn't be getting there, but Tanser hesitates at the back post
James Forrest
It's been coming. Celtic finally break St Johnstone's - and Zander Clark's - resistance with the opening goal.
Substitute Timothy Weah whips in an excellent cross and James Forrest gets in ahead of Scott Tanser to steer the ball home beyond the helpless Clark.
St Johnstone 0-0 Celtic
Willie Miller
Former Scotland defender on BBC Radio Scotland
Quote MessageIt's backs to the wall by St Johnstone and it's been all instinctive, both in terms of saves and clearances. They are standing up to incessant pressure so far
St Johnstone 0-0 Celtic
Image source, bbcWho is impressing? And who isn't? Rate the players here
St Johnstone 0-0 Celtic
Celtic substitute Odsonne Edouard, on the pitch for about five minutes, is injured and replaced by Timothy Weah.
St Johnstone 0-0 Celtic
Pat Bonner
Former Celtic goalkeeper on BBC Sportsound
Quote MessageWas there a shout for a penalty on Ryan Christie before Zander Clark makes another unbelievable save?
St Johnstone 0-0 Celtic
Alasdair Lamont
BBC Sport Scotland at McDiarmid Park
Celtic are spending more and more time in and around the St Johnstone penalty area and it’s really only the ability of Zander Clark that’s preserving the Saints clean sheet now. The question is whether the home side can continue to keep the champions out for another 20 minutes.
St Johnstone 0-0 Celtic
Somehow, St Johnstone's goal remains intact. Clark blocks Sinclair's close-range effort before Shaughnessy hammers clear as Edouard looks to force the ball home.
St Johnstone 0-0 Celtic
Pat Bonner
Former Celtic goalkeeper on BBC Sportsound
Quote MessageI thought Clark was beaten there but, wow, he sticks out a big right hand again.
St Johnstone 0-0 Celtic
This game is fast becoming a Zander Clark showreel.
The St Johnstone keeper denies Jozo Simunovic and then substitute Odsonne Edouard.
Celtic then come within whisker of breaking the deadlock as Ryan Christie sees his shot fly inches wide.
The visitors are carpet-bombing St Johnstone's goal but Zander Clark is proving equal to the task.
St Johnstone 0-0 Celtic
It's that man Zander Clark again. The bearded Ninja displays incredible reflexes to deny Oliver Burke, and Ryan Christie's header from the rebound lacks power and direction.
It's Burke's last efforts, as the winger is replaced by Odsonne Edouard.
St Johnstone 0-0 Celtic
Tommy Wright shuffles his St Johnstone pack: David Wotherspoon replaces Danny Swanson.
St Johnstone 0-0 Celtic
Willie Miller
Former Scotland defender on BBC Radio Scotland
Quote MessageThere's not a lot of space for Celtic to take advantage of. St Johnstone are well-organised and are defending well
St Johnstone 0-0 Celtic
St Johnstone keeper Zander Clark is saving anything and everything in front of him. The visitors appear to be lacking a traditional number 9 in the middle of the box to act as the focal point for their attacks.
St Johnstone 0-0 Celtic
The hosts appear to have have weathered the Celtic storm and are beginning to show greater attacking intent in the second half.
St Johnstone 0-0 Celtic
Willie Miller
Former Scotland defender on BBC Radio Scotland
Quote MessageToljan has made an immediate impact and Celtic fans will not be used to seeing a right-back get to the bye-line
St Johnstone 0-0 Celtic
Willie Miller
Former Scotland defender on BBC Radio Scotland
Quote MessageFor some reason, Tony Watt doesn't manage to make any contact. That's incredible. He just took his eye off it, but he's got to score
St Johnstone 0-0 Celtic
St Johnstone should be in front. Matty Kennedy whips in a superb cross, Tony Watt is rising to head home at the back post... but the striker fails to connect, taking his eye off the ball at the last second.
Wild-eyed expressions all around.
St Johnstone 0-0 Celtic
Pat Bonner
Former Celtic goalkeeper on BBC Sportsound
Quote MessageThat could easily have been a goal but it was a wonderful, wonderful save
St Johnstone 0-0 Celtic
Zander Clark denies Oliver Burke with a brilliant, instinctive save to push away the winger's fierce drive. Great work by debutant Jeremy Toljan who finds Burke with a cutback but the St Johnstone keeper produces a fine save.