West Ham United lost against Manchester City in the third round of the FA Cup on Friday.
Celtic striker Moussa Dembele has been attracting West Ham's attention during the January transfer window.
The 20-year-old Celtic man is rapidly proving a hit in Glasgow.
Mark Warburton's Ibrox side Glasgow Rangers lost 2-1 at Pittodrie.
Celtic beat Israeli side Hapoel Be'er Sheva 5-2 on Wednesday evening.
Ibrox side Glasgow Rangers are not in a position to challenge Celtic, says Frank McAvennie.
Glasgow Rangers midfielder Joey Barton recently claimed that Celtic star Scott Brown is not in his league.
The Premier League side will leave the Boleyn Ground at the end of the campaign.
Ibrox side Rangers won against Old Firm rivals Celtic in the semi-finals of the Scottish Cup on Sunday.
The Hoops manager will come up against perennial rivals Rangers this weekend at Hampden Park.