Peterborough United midfielder Kieran Sadlier played against Celtic while he was with St. Mirren during the 2014/15 campaign.
The Irishman will struggle to break into a high-flying Hammers team.
Leeds United will have a new man in charge of the first team.
Liverpool's transfer business under Brendan Rodgers was largely poor.
The Spanish goalkeeper is set for an Old Trafford departure in the new year.
Newcastle United thrashed Norwich City on Sunday afternoon but their attentions must now turn straight to the Sunderland game.
West Ham have started the Premier League season in impressive form.
This was the performance of the side many predicted Derby County to be before a ball was even kicked.
Sheffield Wednesday midfielder Kieran Lee has made 12 appearances so far this season.
Jurgen Klopp started his career at Liverpool with a draw against Tottenham.