George Elokobi has returned to Colchester on a free transfer from Oldham.
Colchester defender Ben Gordon has had his contract terminated by mutual consent.
Colchester have completed the permanent signing of defender Matthew Briggs on a free transfer.
Wigan Athletic will start life in Sky Bet League One with a tough trip to Coventry City as all three relegated sides are handed away openers.
Burnley have been drawn to play at Port Vale in the first round of the Capital One Cup.
Teenager Kieran Bailey has agreed to sign a development contract with Colchester following his release from West Ham.
Colchester have made defender Richard Brindley their first signing of the summer.
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