The pair have been involved in England coach Fabio Capello's squad this season.
"I've been telling JJ recently to surge forward with the ball," Sherwood told the Telegraph. "He can run. He's a threat. If he stands there and just passes the ball I could still play against him now, so I got out the DVD and showed him what happens when he bursts forward.
"Tom is another one. Pre-season was a real eye-opener because we saw that he can actually move, that he's fit and he can get about the pitch. People say he can't play in a 4-4-2 but he can. In fact, he's perfect for that because he gets more room to show his range of passing."