The midfielder admits West Ham's impressive form has meant him having to wait for his chance of a recall.
Collison told whufc.com: "That's part and parcel of the game. If you look at the quality of our squad, there are 22 outfield players and there is a lot of quality not even making the bench, let alone the starting XI. There is a lot of competition for places.
"The boys have been magnificent, so there has been no reason for the manager to change it too much. They have got the shirts at the moment and, if they keep producing, they deserve to keep them.
"The likes of myself and others are disappointed and are working hard in training so when that opportunity comes, it's up to us to take it and keep hold of the shirt."
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