Partick Thistle ensure Ross County are not yet free of relegation after they come back from behind to win in Dingwall.
Aberdeen roar back from behind to beat Inverness and cement a top two spot in the Scottish Premiership.
Bottom side St Mirren move to within seven points of Motherwell with four games to go by beating Kilmarnock.
St Johnstone overcome Tayside rivals Dundee to move level on points with fourth-place Dundee United in the Scottish Premiership.
Celtic manager Ronny Deila admits his side face another tough encounter when they take on Dundee United at Tannadice in front of the Sky Sports cameras this Sunday.
CELTIC are interested in signing Dutch international Rafael van der Vaart, according to German tabloid newspaper Bild.
JASON Denayer has expressed his willingness to return to Celtic for a second loan spell next season if it is sanctioned by Manchester City.
STUART McCall has backed Ronny Deila’s call for referees to be allowed to explain contentious decisions after games but insists managers must expect to be held to some level of accountability.