Colchester boss Aidy Boothroyd has completed his second permanent signing of the January transfer window by securing the services of John-Joe O'Toole.
The Watford midfielder, who played 19 games under Boothroyd during his loan spell, has signed a two-and-a-half-year deal at the club.
This latest boost follows the news that Kayode Odejayi also turned his loan into a permanent move on a similar deal.
"If we can be successful and keep winning, then we'll keep players," Boothroyd told Colchester's official website. "It's all about timing - I haven't come here to be an Arthur Daley type, selling players all the time.
"I've come here to win. With the players we've got, I think we've got a good chance of sustaining success and we have our targets to help strengthen the squad.
"I don't want to sell players that have done well and I want to keep everyone together to push on."
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