Simon Church scored his third goal in five games for Aberdeen in their 1-0 victory over Dundee United.
Church, earlier, had a goal ruled out for offside, after tapping home a cross from McClean, in a game where the Dons had two goals disallowed. The 27-year-old was also denied a second by a great save from Eiji Kawashima.
Next up for Aberdeen is a trip to seventh-placed Partick Thistle and with Celtic not in action until the following Saturday, Church and co have the chance to close the gap to just one point.