Ryan Howard will have an MRI on his injured left knee on Monday, and the possibility of surgery remains an option for the Phillies' slugger, he announced after Sunday’s victory over the Braves at Citizens Bank Park (see Instant Replay).

Howard went on the disabled list on Saturday after taking infield practice when he felt his knee made it difficult for him to move laterally.

Howard has had some difficulty moving without pain in his knee often this season, but not quite as bad as the pain he felt Saturday.

“We’ll see what happens [Monday] to get a better understanding of what’s going on inside of there and then we’ll address it with either surgery or any other kind of injections,” Howard said. “Right now, it’s too early to tell. Once we find out, we’ll look at it and see what will be the best thing.”

Howard had a cortisone injection for his knee earlier this season and he responded well. However, manager Charlie Manuel said Howard is suffering from arthritis in his knee as well as some pain on the ball of his left foot.

One thing that is not bothering Howard is his ankle. After missing a big hunk of the 2012 season with a ruptured Achilles tendon, the ankle is healthy, Howard says.