Mets pitcher R.A. Dickey has a partial tear of the plantar facia in his right foot, an MRI exam revealed Friday.

Dickey is described as day-to-day.

“I’m optimistic,” Dickey said before Friday night’s game at Citi Field. “I feel like it’s just a matter of managing the symptoms and I’ll be out there.”

He suffered the injury Thursday when he tried to cover first base during a 9-3 loss to the Cubs.

“It’s sore,” Dickey said. “But it’s probably 60 percent better than it was when I did it.”

After a breakthrough season a year ago, Dickey is 2-5 with a 4.50 ERA this year.

Dickey said he expects to throw a bullpen session Sunday to see if he can make his next start.

Terry Collins said he had a contingency plan if Dickey cannot pitch, but did not disclose what that would be.