Watkins will be attending the NFL Players Association's rookie premiere in Los Angeles, an annual promotional event that includes a photo shoot of some of the draft's most recognizable players.
"It’s not his fault that he’s not going to be here the next two days, I wish he was," coach Doug Marrone said Wednesday. "Looking back I made a note that I should have had practice [Tuesday] so I only would have lost him one day. My mistake on that."
Watkins, the Bills' first-round pick this month, saw his first action with second-year quarterback EJ Manuel in Wednesday's OTA.
"He looked good," Marrone said. "Sammy has been doing a nice job."