Celtic moved five points clear of Glasgow rival Rangers at the top of the Scottish Premier League with a 3-1 victory at Dundee United on Sunday.
Celtic went into halftime at Tannadice with a 2-0 lead thanks to deflected efforts by top scorer Anthony Stokes and Mark Wilson.
The hosts, who came into the match boasting an 11-game unbeaten run, halved the deficit in the 64th minute when David Goodwillie crashed home a close-range finish.
But Celtic wrapped up the win when Daniel Majstorovic headed in from an inswinging free kick, extending its run to 16 matches without defeat.
Second-place Rangers, which beat Motherwell 6-0 on Saturday, has two games in hand over its cross-city rival.