Mullins was one of the noticeable improvements in Alan Pardew's successful squad last year and despite missing the FA Cup final through suspension he is clearly looking forward to the challenges ahead next season.
Mullins told Sky Sports News, “It's been unbelievable – no-one at the club would have thought we could have done what we've done this season but the boys' hard work and graft has paid off.
"We worked tremendously hard to be rewarded for an FA Cup final place and a spot in Europe.
“I've never tasted Europe so it's going to be a great adventure. We've got a young and exciting team at West Ham and I'm just glad to be a part of it.”