Defender extends loan until early January.
Luke told the official Everton website: "On a personal level, it's been very good. I've benefited from playing first-team football week-in, week-out. I've gained in confidence from each game that I've played.He will miss the weekend fixture against Swindon Town, but the current extension will take in a further nine games through a hectic Christmas period.
The Everton full back has made a big impression during his time at the Weston Homes Community Stadium and opened his scoring account in the FA Cup game against Sheffield United last week.
U's loanee defender Luke Garbutt has extended his spell with the club until January 4th.
"I'm enjoying my time at Colchester. They're giving me every opportunity to do what I do best on the football pitch."