Pro Bowl tight end Kellen Winslow rejoined the Cleveland Browns on Thursday, one week after he was hospitalized with an undisclosed illness that sidelined him for one game and could keep him out for another.

He’s back with the team, but the timing on Winslow’s return to the field is still unclear.

Winslow spent three nights at the Cleveland Clinic being treated for an illness that has been kept under wraps by the team, which cited privacy laws.

The 25-year-old Winslow was seen walking in the hallway at the team’s training complex Thursday shortly before the Browns practiced outdoors. He remained inside the facility during the 30 minutes that are open to the media.

Coach Romeo Crennel said Winslow could practice on Friday as the club prepares for Sunday’s game against the Washington Redskins.

‘‘He’s a tremendous player and competitor and he makes plays,’’ Crennel said of Winslow, who caught 82 passes for 1,106 yards last season. ‘‘I know defenses hate to see him out there because they have to decide how they’re going to handle him, who they’re going to put on him, if they need to double him or not. I think defenses rather he not be there.

‘‘We want him back.’’

Winslow, whose NFL career has been slowed by injuries, was discharged from the hospital Sunday but was inactive for Cleveland’s 35-14 upset of the New York Giants on Monday night.

Without Winslow, arguably the most indispensable player on Cleveland’s roster, the Browns had their best game of the season. Steve Heiden started for Winslow and caught five passes for 59 yards. Backup tight end Darnell Dinkins caught a 22-yard TD pass and quarterback Derek Anderson completed 18 of 29 passes with two touchdowns and no interceptions as the Browns (2-3) shocked the Super Bowl champions and saved their season.