Gayle has been in superb form so far this season for Newcastle after joining from Crystal Palace in the summer.
He currently has 13 goals to his name in the league after scoring a brace in the 2-0 win over Leeds United on Sunday.
His performances have earned rave reviews, with Magpies boss Rafa Benitez looking like he has pulled off one of the signings of the season.
Sinclair has certainly been impressed by what he has seen, likening Gayle to the legendary Arsenal and England forward.
“He reminds me of Ian Wright. He’s an absolute pest. If you get the ball to him he’ll put the ball in the net,” Sinclair told BBC Radio 5 Live 606.
“He didn’t get the opportunity at Palace but he’s been given the number nine shirt at Newcastle and he’ll continue to score goals for them.”
Gayle’s goals have helped Newcastle to the top of the Championship, five points clear of Brighton & Hove Albion in second place.
They will be hoping Gayle can continue to keep finding the back of the net for the remainder of the season as they eye an instant return to the Premier League.
If Newcastle do end up making it back to the top flight, Sinclair is backing Gayle to get the goals there, too.
“Given the opportunity he would have scored goals for Palace this season but if Newcastle continue to play like this, he’ll score goals in the Premier League for them next season as well,” he added.