The former Wakefield winger, who has linked up with Fiji for the World Cup, has scored 23 tries in 26 appearances since joining the Bulls from Trinity at the start of the season and believes there is much more to come.

"I've still got plenty of room for improvement," he said. "I'm always pretty critical on myself and scoring 23 tries doesn't change that because I'd have liked to have done a lot better and can do more in attack and defence.

"I'm definitely pleased to get the contract sorted. It's only for a year, but that's all I signed last time and it worked out."

Bradford coach Steve McNamara said: "I am delighted that Semi has decided to stay. I am looking for him to make an even bigger impact next season."

Castleford Tigers have confirmed the release of Australian prop Michael Korkidas, a move which will allow him to take up a three-year deal with Huddersfield Giants.

Wales coach John Dixon has included seven Celtic Crusaders players in his 18-man squad for the international against England at Doncaster's Keepmoat Stadium on Friday week.

The squad features just five players from Super League clubs – captain David Mills of Hull KR, Dave Halley, Craig Kopczak and Matt James from Bradford Bulls and Warrington's Andy Bracek.

Wales squad: Bracek (Warrington), Davies, Flower (both Celtic), Gibson (Halifax), Halley (Bradford), A James, J James (both Celtic), M James, Kopczak (both Bradford), Lennon (Celtic), Mills (Hull KR, capt), Penkywicz (Halifax), Roberts (Oldham), Powell (Dewsbury), Watson (Leigh), Webster, L Williams (both Celtic), R Williams (Warrington).