Danny Swanson's goal gives Saints victory
Leaders Celtic remain six points clear
St Johnstone move above Dundee into sixth
Celtic miss out on ninth straight league win
Clive Lindsay
"It is a game in which there is no pressure on us and we have nothing to lose.
"Celtic will be looking for a quick start as they didn't start too well on Sunday.
"You know what football's like. We are capable of getting a result, but we know we have to play very well.
"We don't want to be defending for 90 minutes."
BBC Radio Scotland 810MW coverage of tonight's game has just resumed should you wish to listen to the pre-match build-up and the live commentary.
The big news in Scottish football today was the suspension of trading in Rangers' shares on the AIM stock market. What does that mean for Friday's extraordinary meeting, at which shareholder Dave King hopes to replace the current board? If there are any financial experts out there, you can pass us your words of wisdom.
Nicky Law, meanwhile, thinks his former manager at Motherwell, Stuart McCall, would be a good team boss at Ibrox. You can give us your thoughts on that too.
Meanwhile, the Scottish FA has joined its Welsh counterparts by opposing suggestions from the FA in England that it would like to field a GB team at next year's Rio Olympics. But what do Scottish fans think?
Of course, you might simply want to comment on tonight's game as it unfolds.
Tweet us or give us your thoughts on the BBC Scotland Sport Facebook page.
Celtic have made two changes following Sunday's victory over Aberdeen, with striker Anthony Stokes and midfielder Stuart Armstrong, who has recovered from injury, replacing Kris Commons and Nir Bitton.
St Johnstone know they face an uphill task to claim that victory in Glasgow as their hosts are chasing a ninth straight Premiership victory. Celtic have won 4-0 in their last three home league games, have only lost one goal in their last 11 domestic matches and have already defeated Tommy Wright's side twice this season, both times in Perth.
St Johnstone have slipped to seventh in the Premiership but can move back above Dundee should they win at Celtic Park.
Celtic will move nine points clear of Aberdeen, who they defeated 4-0 at the weekend, should they overcome St Johnstone.
Technical problems at Celtic Park - a power outage apparently - has interrupted BBC Radio Scotland 810MW coverage of tonight's game. If you are listening, enjoy the music on Get It On until we can find a new plug!
Welcome to our live text coverage of tonight's Scottish Premiership meeting between leaders Celtic and seventh-placed St Johnstone.