Celtic's Leigh Griffiths made headlines for the wrong reasons in Belfast.
The £4.5 million man has made an impression at Celtic already.
Celtic signed the 19-year-old this week from the Championship.
Celtic have been linked with a move for the talented Aberdeen star.
Celtic have enjoyed a brilliant season, but Davie Hay has urged Brendan Rodgers to make some further signings this summer.
Moussa Dembele has been sensational since joining Celtic, and his agent gave Hoops supporters reason for optimism this week.
Celtic have made a brilliant start to the season but Hay thinks there is still improvements to be made.
Celtic have already created a tremendous amount of daylight between themselves and their rivals.
Warburton is preparing his Glasgow Rangers side for the Old Firm Scottish League Cup semi-final on Sunday.
The Scottish Premiership side were thrashed by the Catalan giants.