Collison struck in West Ham's Capital One Cup win over Burnley.
He told whufc.com: "The loan move was a great experience and it was invaluable getting game time. I played four 90 minutes back-to-back in a month, which I haven't done in a long time. I'm back now and I feel fitter and sharper.
"You could say I've got a new lease of life and I feel ready to go again and to fight for my place. Nights like Tuesday will obviously go in my favour and hopefully I've given the gaffer a few headaches and see where we are in a few weeks."
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