There will be changes made to the roster of the Philadelphia Phillies, says Ruben Amaro, Jr.

The general manager made the comments after sending John Mayberry, Jr. to the Toronto Blue Jays for Minor Leaguer Gustavo Pierre.

"Not that it's a huge change, but we're going to have to start churning the roster in a way that it's going to have to be improved," Amaro said, adding that some moves could be significant.

"I think we need it," he said. "I think we need it because what we have on our roster right now is not working. How much we'll do will depend on what makes sense for us. We're still kind of assessing what we have. But I think it would behoove us to make some change because we need to be better."

Amaro declined to say if those changes could extend to staff and management positions.

The Phillies are 63-74 and more than 15 games back in the National League East.