Dillon Gee's recovery from a right lat injury suffered an apparent setback Sunday when he canceled a planned bullpen session. Mets general manager Sandy Alderson acknowledged that his tentative June 5 return date from the disabled list is "not realistic."

Alderson said Gee did not feel comfortable enough to attempt the bullpen session. His continued absence provides more opportunity for young starters Rafael Montero -- who gave up one run in six quality innings in the Mets' 2-1 loss to Arizona in the first game of Sunday's doubleheader -- and Jacob deGrom, who faces Pittsburgh Monday.

"It's nice that we've got those two guys and we've been able to go to them," Alderson said. "But we'd like to get Dillon back in the rotation. He's pitched great for us this year. The sooner we get him, the better."

Young Jr. to DL?

Outfielder Eric Young Jr. suffered a right hamstring injury in Saturday's loss to the Diamondbacks and likely is headed for the disabled list, Alderson said. Young didn't play in Sunday's doubleheader and Alderson said the Mets have called up outfielder Matt den Dekker from Triple-A Las Vegas.

"We'll take another look at ," Alderson said. "In the meantime, we've got to get somebody else in here in case he can't go."

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Black sent back down

Relief pitcher Vic Black, called up from Las Vegas to serve as the 26th man, did not appear in either game and was sent back down to Triple-A . . . Ike Davis returns Monday with the Pirates, his first game at Citi Field since being traded last month . . . The Mets will wear camouflage hats and jersey numbers for the Memorial Day game.