Dallas Cowboys rookie guard Connor McGovern suffered a setback in his recovery from a partially torn pectoral muscle and could miss the season, the Dallas Morning News reported Thursday.

McGovern, who has not played during the preseason and has missed all but two practices in training camp, reportedly suffered a smaller sprain separate from his initial injury. He does not need surgery but the timetable for recovery is unknown.

The Cowboys’ third-round pick in this year’s draft out of Penn State, McGovern was listed as the third-string left guard and was expected to back up guard Connor Williams. Dallas could place McGovern on season-ending injured reserve or keep him on the 53-player roster for a day before placing him on injured reserve, which would give the 21-year-old an opportunity to return this season.

Each NFL team must reduce its roster to 53 players by 4 p.m ET on Saturday.