Thanks for your company and contributions this evening. I hope you can join my colleagues tomorrow when they bring you coverage of five Scottish Premiership matches. All the best.
- Champions visited McDiarmid Park
- Saints move above Dundee United into fourth place
- Points shared in exciting match in Perth
The highlights of this are well worth watching. They will be available at midnight on the BBC Sport website.
So St Johnstone move in to fourth place in the table but have now played a game more than Dundee United. Remember, whoever comes fourth will play in the Europa League qualifiers if Inverness Caledonian Thistle beat Falkirk in the Scottish Cup final. That's because Inverness have already qualified for Europe by dint of their third-place finish in the Premiership.
J Harkins: "I shut my eyes every time Ambrose gets the ball. The trouble is, so does Ambrose."
Gizgaz: "There you go, tells a story about what happens with a bonus structure."
Celtic manager Ronny Deila
"I thought it was open, way too far open. I don't like when games are like that. That pitch is very poor, so hard to control the ball. We had some good performances, I think James Forrest was good on the right side. Lukasz (Zaluska) was unbelievable, very good for him and for us. I'm not so happy, but we didn't lose, we didn't concede any goals. We have an opportunity to break a clean sheet record - 17 games is the lowest, I think - so it is going to be an important game when we host Inverness."
St Johnstone manager Tommy Wright
"I don't think there was much bad finishing, it was good goalkeeping and bad luck. We can play decent football, that was a 90-minute performance. Yet we're pleased to win a point because Alan Mannus pulled off a great save at the end. Us older managers know how to get players through a season. I think we use the squad really well. That's why at this time of the season I think we are working really well."
Former Aberdeen manager Willie Miller
"Tommy Wright will be bemoaning the fact that they had enough chances to win two or three chances and they didn't take them. But he will be more than delighted with their performance. If they played like that in every game not only would they be fighting for fourth place, they'd be higher!"
Former Aberdeen manager Willie Miller
"James Forrest went off the pitch looking distraught."
Alex, Greenock: "Mulgrew slots back in naturally yet I think Ambrose needs a few seasons in the juniors to learn how to defend, he is not a defender." Harsh words, Alex!
My colleague John Barnes loves a stat and he tells me that Celtic have now kept a clean sheet on 30 occasions this season out of 60 matches.
My-oh-my, what an effort by St Johnstone to win that match. They are the only team to have beaten Celtic in the league since the turn of the year but they just could not do it again tonight. What a great game.
It's the second time St Johnstone have hit the post this evening, this time Murray Davidson the unlucky man in blue. At the other end, rounding off a four-on-two break, Leigh Griffiths draws a superb save from Alan Mannus with a shot from eight yards.
Celtic winger James Forrest is incredulous as he misses an empty net from six yards.
James in Leicester discusses our pal Logan in Perth: "Logan is part of the Celtic family, we're everywhere and we're not apologising for it."
It's Celtic who push forward with three minutes to go. It really would be sore on the home team if they were to lose it now. They have looked the more determined team tonight, yet Celtic have had chances too.
Emilio Izaguirre possibly got a touch to knock James McFadden's header on to the post. He leapt to try to head it clear.
Incredibly, Celtic winger James Forrest misses an empty goal from about six yards having rounded Alan Mannus. TV replays show the ball bobbled slightly just as he swung his boot, but an amazing miss all the same.
James McFadden hits the post with a flashing header!
What on earth was Steven Anderson thinking about there? He looks to the heavens after he balloons a shot, or was it a cross, high, high into the night sky and over the bar.
bringthemonjpn: "#bbcscotfootball Yes, Celtic unable to score away from home once again. Troubling times for the manager."
Former Scotland favourite James McFadden replaces Steven MacLean, who has had a quiet match up front for Saints.
Michael O'Halloran does well to cut inside and crack a low shot in at the Celtic goal where Lukasz Zaluska is well positioned.
St Johnstone's Danny Swanson is next to go in to the ref's book, for a sneaky clip at James Forrest's ankles.
Michael O'Halloran opts to shoot from 25 yards but his effort blazes over.
Saints defender Steven Anderson out-paces Leigh Griffiths in a race from the halfway line. He knocks it back to his goalie and makes himself available for the pass as Saints try to keep up the momentum.
Celtic midfielder Scott Brown is booked for sending Danny Swanson spinning.
Anonymous: "Hey Logan (21:05) why don't you give support to your local team!!"
Two changes for Celtic: Emilio Izaguirre replaces Celtic's 17-year-old left-back Kieran Tierney and Kris Commons comes on for Stefan Scepovic.
And Mulgrew, in his first appearance since December, gets up well above Steven Anderson to head straight at keeper Alan Mannus at the back post. It was a very tight angle to score from, mind you.
Celtic's versatile Charlie Mulgrew has been thrown into defence duties on his return.
Stefan Scepovic is preparing to come on for Celtic...
Danny Swanson shows a few lovely touches to control the bouncing ball, dink it over his opponent and start an attack.
BBC Scotland commentator Liam McLeod
"Fourth place could mean European football, Europa League qualifying, but it would mean a very early start for St Johnstone. They are used to that now."
Leigh Griffiths rises well to head flick on to Kris Commons at the back post but the Celtic attacker is off balance and shoots wide from close range.
Logan from Perth: "Celtic really need 2 switch on!!! We r getting dominated!!"
Stuart Armstrong slides the ball in to the path of Celtic team-mate Scott Brown whose snap shot sails over the bar of Alan Mannus.
Half an hour to go in Perth.
This half has been a bit more tame in terms of goal chances, but again it's the home side who look the more likely to score.
Good to see Michael O'Halloran sporting a wide grin, despite not converting those first-half chances. He was out-muscled by Celtic's Stuart Armstrong as he chased a long ball there.
With Lukasz Zaluska rushing off his line, Charlie Mulgrew slides in to clip the ball away from Michael O'Halloran just as the Saints striker was about to shoot.