The powerful 22-year-old midfielder has put pen to paper on the deal which keeps him at the club until the end of the 2017-18 season.
Ince said: “I’m really pleased to sign the new deal. I’ve been at Brighton for a while now and I’ve really tried to impress the manager, the fans and everyone at the club. Hopefully I’ve managed to do that and I’ve been rewarded with a new contract.
“But I’m not going to just stop with this contract. I want to keep improving and really push on this season and try and get as much time on the pitch as possible.”
Albion manager Chris Hughton added: “We are delighted that Rohan has signed his new long-term contract.
“As a club, we are determined to hold on to our young players – as we did with Lewis Dunk during the transfer window.
“Since arriving at the club Rohan has had good involvement in the first team, but is still very much in his development years and we are certain there is more to come from him.
“During his time here he has played predominantly in a defensive midfield role, but we are very keen to develop his all-round midfield play, and this new contract will help us to do that.”
Ince joined the club from Chelsea in July 2013 and broke into the first team under Oscar Garcia after an impressive pre-season.
He went on to make 33 first team appearances during the 2013-14 campaign, finding the net once and also winning the club’s young player of the season award.
Last season Ince made 38 appearances, scoring three times – including his wonder strike at Swindon that was voted goal of the season by Albion supporters.
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