The Hammers joint-chairman feels the club may rue their exit from Europe.
The Hammers recruited heavily over the summer and now boast one of their strongest squads in recent memory, but their exit from both the Europa League and the League Cup has limited the opportunities for some of their squad members.
“At this moment in time I wish we were in Europe,” said Sullivan on whufc.com.
“I didn’t wish it in the first few weeks of the season when we had five young kids on the bench against Liverpool.
“But now everyone’s coming back – Alex Song is under two weeks away – (more games would be useful).”
Slaven Bilic has guided his talented crop into third place - after six wins, two draws and two defeats in their opening ten games – but keeping his sizeable squad happy could prove a challenge as the season wears on.
While results remain positive fringe players will have little grounds with which to argue, but should a slight dip in form arrive, Bilic will need his man-management skills working overtime to keep harmony amongst his squad.
The bar has now been set extraordinarily high at Upton Park and it will be an intriguing watch to see whether the Premier League’s surprise package can go the distance this season.