A Gary Hooper double helped Celtic to recover some pride days after crashing out of the Europa League as they beat St Mirren 2-0 to move within a point of top spot in football's Scottish Premier League.
The victory ended a winless streak of three matches at home and in Europe for Neil Lennon's side.
Anthony Stokes had the ball in the net in the early stages, but referee William Collum judged him to have fouled Saints defender Marc McAusland beforehand.
However, English striker Hooper opened the scoring in the sixth minute when he played a sharp one-two with Stokes on the edge of the penalty area before keeping his cool to bury the ball past Craig Samson.
Hooper then doubled the Hoops' lead six minutes later when he intercepted a slack pass from Paul McGowan and raced clear to fire a crisp finish into the bottom corner of Samson's net.
St Mirren piled on the pressure in an attempt to get back into the game with McGowan nearly making amends for his blunder with a strike that Fraser Forster did well to beat away.
The Buddies continued to try and find a way to break down the Celtic defence in the second-half but had keeper Samson to thank for keeping the scoreline down after he made good saves from South Korean Ki Sung-Yeung and James Forrest late on.
