Richard Fitts (right pectoral strain) should be going on a rehab assignment “in the next few days,” said Red Sox bench coach Ramón Vázquez before he managed Monday night’s series opener against the visiting New York Mets. (Manager Alex Cora was at his daughter’s graduation from Boston College.)

“He looks good, by the way,” Vázquez said of the rookie right-hander. “He threw the up-and-down the other day and he said he feels great, felt great right after, so that’s really good news.”

As of pregame Monday, right-hander Walker Buehler (right shoulder bursitis) is still scheduled to be activated from the injured list to start Tuesday’s game.

Vázquez wasn’t sure about a timeline for Romy Gonzalez (left quad contusion), but said the utility-man is “doing a lot of other stuff,” including hitting, taking throws, and running sprints. “So, so far I think we’re on schedule with him, with whatever they have planned,” he added.