The fullback has just had his loan extended to January 4.
Martinez told evertontv: "The team and the Colchester manager are really pleased with his progress and I've been really happy with the way he has been adapting to what he has had to do for the team.
"He's playing a really important role with Colchester.
"He has already got five yellow cards so that shows you he has been getting really stuck in into his defensive duties.
"He's been successful there and they're pleased with him so there's no reason not to extend."
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