Sims, who made his Premier League debut against Everton last November, has agreed a new deal that will keep him at St Mary’s until the summer of 2020.



The 19 year-old, who has represented England at youth level, has made eight appearances since his debut against the Toffees, featuring four times in the Premier League so far.



Speaking about his new contract, Sims said: “I’m absolutely delighted to sign a new contract with the club. I’m really happy that the club have put faith in me to offer me a new contract.



“I can’t really put into words how good it has been recently, but I just need to push on now and continue my progress.



“I can’t see why you wouldn’t want to sign here. This is definitely the club for me to help me progress and aspire to be like some of the other Academy graduates to have come through.”



First Team Manager Claude Puel with Josh Sims

Executive Director of Football Les Reed added: “We’re thrilled that Josh has extended his commitment to Southampton Football Club until at least 2020.



“Josh has shown a constant progression in recent years, which has been extremely pleasing, and this has been highlighted by his fantastic performances in the first-team this season.



“He has displayed an excellent maturity over the course of the campaign, and has looked very comfortable as part of Claude Puel’s squad.



“Following on from Harrison Reed, Sam McQueen and Jake Hesketh earlier in the season, we’re delighted that yet another Academy graduate believes they’re in the right place to continue their development.”