Tim Tebow needs to get another J.C. in his life -- Jose Canseco -- with the ex-MLB slugger telling TMZ Sports he can turn Tim into a legit power hitter.
Jose is dead serious ... he wants to be Tim's personal hitting coach. And, he's offering up his services for FREE!
And, why? Jose sees real potential in Tim but says his swing sucks ... and he's just the guy to fix it.
"I can definitely turn him into a power hitter," Canseco tells TMZ Sports.