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Tom Rogic and David Turnbull also scored as the visitors won 3-0 in the cinch Premiership.
The Dundee boss says back-to-back wins have everyone pulling together.
Saints have lost three matches in a row and slipped down the table.
Hearts, who lost 1-0 at Celtic Park on Thursday, face a trip to West Lothian on Sunday.
The Swedish defender struggled in the early weeks of his Celtic career after arriving from Rubin Kazan in late July.
A 24-year-old was arrested in connection with the incident at Celtic Park on Thursday.
The Celtic boss said United "frustrated" his side in their last game.
Rutherglen Ladies defied a ban on women's football to play in front of huge crowds.
The manager was unhappy with the decision to allow Celtic's goal.
Celtic moved to within four points of Rangers with a 1-0 home win.
The Easter Road club were unhappy with the initial allocation for the match against Celtic.
John Needham was found to have broken Scottish FA rules with historic tweets
Storm Arwen caused damage to the roof of the Jerry Kerr Stand.