Oct 22, 2009 8:58 PM EST

The Phillies are concerned that Cole Hamels might be tipping his pitches.

The team is worried that he has been alerting hitters of his pitches with his wrist placement.

Phillies personnel wouldn't confirm the switch to a larger glove, which might rectify the problem.

"But that would make sense," one insider told the Philadelphia Inquirer.

Via Philadelphia Inquirer