Aberdeen beat Heart of Midlothian 1-0 in Sunday's William Premiership match thanks to a goal late in the first half from Topi Keskinen.
Derek McInnes' men are four points clear at the top of the table but Celtic have a game in hand while the Dons are now just four points outside the top six.
Next up for Hearts in the Premiership is a trip to Motherwell on Saturday while Aberdeen travel to Livingston next Sunday.