Anthony Stokes' first-half winner in a 1-0 victory against Aberdeen at Parkhead took Celtic five points clear of Rangers at the top of the Clydesdale Bank Premier League.
The Hoops striker ran on to a Gary Hooper pass in the 27th minute to round Dons keeper Jamie Langfield before stroking in to an empty net.
It was enough to widen the gap at the top of the table over the Ibrox men, who lost at Hearts earlier in the day, albeit the Light Blues have two games in hand.
Celtic pressed for the opener with some vigour and as the Dons rearguard defended at a stretch, Hooper's dangerous cross from the right in the 12th minute just failed to get through to his waiting strike-partner Stokes.
The visitors appeared to have worked their way in the game to an extent but it was Stokes who broke the deadlock after Hooper's through ball had beaten the Dons' defence,.
With the Pittodrie men looking in some hope for offside, the former Hibernian striker confidently rounded Langfield and knocked the ball in from a yard.
Aberdeen might have taken some comfort from the occasional moments of nervousness in the Celtic defence which caused some concern for the home fans in the first half. However, the Granite City club were put on the back foot again almost immediately after the game restarted although in the 50th minute Dons striker Chris Maguire had a snap-shot from 25 yards which went past the far post.
Moments later, after Hoops defender Thomas Rogne failed to control a long ball, Maguire came closer with a better effort from the same distance.
In the 75th minute former Arsenal star Freddie Ljungberg was given a huge cheer when he replaced Patrick McCourt to make his home debut.
Play was stretched in the closing minutes but Celtic held on against a late Aberdeen surge to take the points and increase the pressure on Old Firm rivals Rangers as the SPL title races hots up further.
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