The Hammers take on the managerless Swans on Sunday afternoon.
The Hammers travel to Wales to take on the Swans looking to turn around a recent poor run of form, which has seen them go winless in six games.
They would be confident of changing that against the Welsh side, with them currently 17th in the table and on a poor run of form themselves, a run which saw them sack manager Garry Monk.
They were much improved against Manchester City last weekend though and unfortunate to lose, and Tomkins says they are not sure what side they will be going up against.
“You never know what you are going to get with a team who have just changed their manager,” he told whufc.com.
“We will see what sort of team we will face on the day, but they are still a good team. A couple of bad results don’t make them a bad team.”
“I know they are down there though so if we can get on top of them, the crowd are going to get on them. Everybody is looking forward to it and hopefully we can get some points on the board.”
If West Ham are to return to winning ways this weekend, they will need several of their squad players to start performing.
With several first team regulars currently out injured, Slaven Bilic’s side has been stretched to the maximum, and it has shown in recent performances.
Michail Antonio came in for his first start against Stoke last weekend and impressed though, so the Hammers will be hoping for similar performances this week.