Gayle was pictured in the club’s new all-blue Castore training kit – the club this week confirmed that it had signed a long-term deal with the sportswear firm – along with a number of team-mates.
Steve Bruce’s players have started pre-season training ahead of the new season, which kicks off next month, following a round of Covid-19 tests.
Gayle’s deal had been due to expire at the end of last month, but the striker is understood to have signed a new three-year contract. The club has also taken up an option to extend Paul Dummett’s contract, and the defender was pictured at the training ground.
Meanwhile, defender Florian Lejeune and forward Yoshinori Muto, loaned to Alaves and Eibar respectively last season, are also back at the club along with Callum Wilson, who missed the end of last season through injury.