Carl Jenkinson has signed a new long-term contract at Arsenal and re-joined West Ham on loan for the 2015-16 season.
The England full-back enjoyed a successful spell at Upton Park last term, making 32 Premier League appearances as West Ham qualified for Europe via the fair play route.
The 23-year-old's existing Arsenal contract had been due to expire in 2018.
"I'm really happy to be back [at West Ham] after last year," he said. "It was a good season for the club and a good season for myself.
"To be honest I just wanted to come back here and I'm happy everything's been sorted out. I've got another season here and I can't wait.
"I'm a young player and I haven't had too many experiences of different clubs, but I loved every minute of it here. Everything about it is fantastic - it's a real family club, the lads are great and the fans are great, so it ticks all the boxes you want when you join a football club.
"I've got to come in, show what I can do and prove myself to a new manager. That keeps you on your toes and I've got to go and do that in pre-season. I'm looking forward to it."
