The midfielder grabbed an unlikely goal in the 2-1 defeat against Manchester City but now faces a race against time to be fit for the trip to the Bet365 Stadium on Saturday after coming off just before the break.
Marney will be assessed over the coming days and Sean Dyche will not want to take any chances on him unless he is fully fit. However the player himself does not sound too concerned.
“It’s not too bad,” he revealed. “I’ve had a bit of a nerve problem in the back or hamstring and sometimes it gets to a point where you just can’t continue.
“I was gutted but against a team like that if you’re not 100 per cent you’re going to get found out.”
Colchester will hand late fitness tests to Ryan Jackson and Brandon Comley prior to their clash with Yeovil.
Arsenal secured their place in the quarter-finals of the Europa League following their 3-1 defeat of AC Milan at the Emirates Stadium on Thursday.
Danny Welbeck scored twice against AC Milan to toast his England recall by sending Arsenal into the last eight of the Europa League.