Prospect Michael Kopech, the 19-year-old righthander who suffered a broken bone in a fight with his teammate, underwent a procedure in Boston on Tuesday to insert a screw into his right hand to stabilize the fracture, according to a major league source.

He’s expected to be sidelined for approximately six weeks before he can start preparing for the season, meaning that the earliest he would pitch for a Red Sox minor league affiliate would be mid- to late-May.