St Johnstone beat Hibernian 1-0 in the Scottish Cup final on Saturday to seal a historic domestic cup double having also won the League Cup.
Rangers produced another ruthless display as they smashed St Johnstone 4-1 at McDiarmid Park.
A much-changed Celtic side failed to hit their European heights as St Johnstone held them to a goalless Scottish Premiership draw at Parkhead.
Manchester United have signed teenage goalkeeper Matej Kovar and sent midfielder Matty Willock on loan, the club have confirmed.
Rangers' rejuvenation under caretaker boss Graeme Murty came to an abrupt halt with a 3-1 defeat by St Johnstone at Ibrox.