The Nationals keep running into walls trying to find out if Joan Adon can become a regular member of their bullpen.
Adon was placed on the 15-day injured list this afternoon with a right shoulder biceps strain, removing the erratic reliever from the active roster again and replacing him with rookie Orlando Ribalta, who was recalled from Triple-A Rochester.
The Nats are awaiting MRI results on Adon, who had not pitched in six days but did briefly warm up during Monday night’s game against the Yankees. Teams cannot backdate IL moves more than three days, so Adon won’t be eligible to return until Sept. 10.
The 26-year-old, a starter throughout his professional career, was moved to the bullpen in Rochester earlier this season, with the Nationals thinking he might develop into an effective long man. But he’s appeared in only eight big league games across three stints with the club, and he has yet to record more than four outs in any relief appearance.
Ribalta returns to the majors only eight days after he was optioned to Triple-A, a move that came only seven days after he made his big league debut. The 6-foot-8 right-hander was scored upon in each of his two appearances for the Nats but sported a 2.64 ERA, 1.154 WHIP and 69 strikeouts in 47 2/3 innings at Rochester and Double-A Harrisburg.