Michael Conforto left Thursday's game against the Nationals in the bottom of the fifth inning after getting hit in the face by Robinson Cano's shoulder while both of them were trying to field a fly ball.
After the game, Mets manager Mickey Callaway said Conforto had been diagnosed with a concussion and will be traveling back to New York via train to be evaluated further.
During the play where Conforto was injured, Cano called for the ball and then had it nick off his glove and land in fair territory. Conforto was also calling for the ball late.
After being checked on by the trainer and Callaway, Conforto was removed from the game and replaced by Keon Broxton.
If the Mets opt to place Conforto on the IL, he can be placed on the 7-day concussion IL.
As far as potential replacements for Conforto if he is out, Carlos Gomez is hitting well for Triple-A Syracuse and has a June 1 opt-out in his contract.
Another option could be Dominic Smith, who played a bit in the outfield in 2018. However, the Mets have so far refused to play Smith in the outfield this season -- despite him asking to play out there.