Celtic look set to beat Dundee United for the third time in a row as they lead 3-0 at half time in the Scottish Premiership.
Former Dundee United duo Gary Mackay-Steven and Stuart Armstrong combined in the ninth minute but Armstrong's shot was too high from outside the penalty area.
Mackay-Steven then came back to haunt his former employers seven minutes later, hammering the ball past a crowd of players into the bottom corner.
Celtic continued to dominate, with Nir Bitton and Armstrong seeing their shots saved before John Guidetti doubled the lead for the Hoops. The Swedish striker combined well with Stefan Johansen before striking into the top-left corner from outside the area.
Nadir Ciftci was United's main threat in the first half but failed to test Craig Gordon on two separate occasions.
United struggled to cope with Celtic's front four as Mackay-Steven hit the post just before half time after linking up with Johansen and Armstrong.
Jason Denayer added a third in stoppage time, scoring from close range.
