Part of a statement on the official Colchester United website reads: "In light of the recent disruption that has taken place at Vicarage Road with the manager leaving, their chairman felt that by allowing Jason to leave, it left their squad depleted and formally requested that he returned to Watford straight away.
"He had been in to Layer Road this morning and signed the paperwork involved to complete the move, but after Watford got in touch to say that they had changed their mind, this paperwork was not submitted to the Football League."