Robbie Keane's Celtic debut went spectacularly awry as Tony Mowbray's reign hit a new low with the club's first defeat to Kilmarnock in 32 meetings with a 1-0 loss.
On-loan Tottenham striker Keane missed two golden opportunities to score in either half and he was upstaged shortly after the break by Chris Maguire, who celebrated his own debut with a fine winner for Killie.
The result left Celtic 10 points behind Rangers, but now having played the same number of games, while also giving their opponents' survival hopes a massive shot in the arm.
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