Lukas Julis fires home from close range with the home defence all at sea before he guides home a second
Substitute Leigh Griffiths turns in rebound but Julis completes hat-trick just minutes later. Ladislav Krejci nets fourth
Celtic now bottom of Europa League group with one point
FT: Benfica 3-3 Rangers
Celtic 1-3 Sparta Prague
Neil Lennon stands on the touchline, arms folded, clearly unhappy with how his side have crumbled defensively.
They've looked like conceding to this under-strength Sparta Prague side evert time the Czechs have bombed forward.
Celtic 1-3 Sparta Prague
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Celtic 1-3 Sparta Prague
Celtic are intent on reducing the deficit but Sparta Prague look like they can score at will on the counter.
The hosts have been punished time and again for defensive mistakes.
Celtic 1-3 Sparta Prague
Pat Bonner
Former Celtic goalkeeper on BBC Sportsound
Quote MessageThat's the danger when El Hamed is high up the pitch, you get done on the counter. I've got to say Karlsson goes past Duffy far too easily. I've got no idea why he's diving in there.
Lukas Julis
That could be that. Sparta Prague hit Celtic with a deadly counter attack, slicing the defence apart and Karlsson speeds away from the despairing Shane Duffy before centring for Lukas Julis to fire home his hat-trick.
Too easy for the visitors as they leave Celtic's Europa League campaign in tatters.
Image source, BBC SportCeltic 1-2 Sparta Prague
Ryan Christie goes in the book for an over-zealous challenge as Celtic search for what at one stage appeared to be an unlikely equaliser.
Celtic 1-2 Sparta Prague
Pat Bonner
Former Celtic goalkeeper on BBC Sportsound
Quote MessageElhamed has come on as the third centre back but he's getting forward quite a bit. The Sparta left back doesn't know whether to stick with him or Frimpong. They're causing a lot of issues on this right-hand side.
Celtic 1-2 Sparta Prague
Kheredine Idessane
BBC Sport Scotland at Celtic Park
Well, well. Talk about fine margins. And clever substitutions.
Sparta were within an inch of a 3-0 lead, but the ball came back off the post. Seconds later, having decided to keep Tom Rogic on and sacrifice others, Neil Lennon sees the Australian draw a fine save from the Prague goalkeeper before sub Leigh Griffiths buried the rebound to reduce Celtic’s deficit. The home side now have 20 minutes to find an equaliser having been completely outplayed up until now.
Celtic 1-2 Sparta Prague
Celtic substitute Leigh Griffiths firs a free-kick at goal but the ball is beaten away by Nita.
Celtic 1-2 Sparta Prague
James McFadden
Former Scotland forward on BBC Radio Scotland
Quote MessageThis is far more encouraging it's been much better from Celtic in the second half. Leigh Griffiths has made a big difference since coming on.
Lille are 3-0 up in Milan, courtesy of a Yusuf Yazici hat-trick...
Celtic 1-2 Sparta Prague
Neil Lennon gives his side some tactical instructions as he urges them forward in search of an equaliser.
Ryan Christie fires a shot at goal from about 20 yards but Sparta Prague goalkeeper Nita is equal to the task.
Leigh Griffiths
Seconds after the visitors strike the post, Celtic reduce the deficit with 25 minutes remaining. Tom Rogic sees his shot saved but substitute Leigh Griffiths is there to hammer home the rebound from close range.
Celtic 0-2 Sparta Prague
Neil Lennon will be hoping his substitutions can act as a catalyst to get back into this game and breathe life into their stuttering Europa League campaign.
Celtic 0-2 Sparta Prague
Two changes for Celtic: Leigh Griffiths and Hatem Elhamed come on for Scott Brown and Mohamed Elyounoussi.
Celtic 0-2 Sparta Prague
Jeremie Frimpong fires a shot inches wide as Celtic search for a way back into this game.
Celtic 0-2 Sparta Prague
Pat Bonner
Former Celtic goalkeeper on BBC Sportsound
Quote MessageI think if a change is to come Tom Rogic has to come off here. He's not affecting the game in either direction. Get Leigh Griffiths on and get Odsonne Edouard some support up front.
Celtic 0-2 Sparta Prague
Odsonne Edouard is cutting a forlorn figure for Celtic up front... his midfield team-mates have been unable to get the Frenchman into the game or offer him many chances to get a strike on goal.
Celtic 0-2 Sparta Prague
James McFadden
Former Scotland forward on BBC Radio Scotland
Quote MessageNeil Lennon has got to make a change here. I think they need someone up there to support Edouard. They have to go for it here.
Celtic 0-2 Sparta Prague
One through ball splits Celtic's shaky defence and Moberg Karlsson is denied a shot as he looks to pull the trigger, a desperate sliding challenge by Shane Duffy preventing another shot on target.