Romero and Bray both have been setback by shoulder issues this month.
The Nationals have until the middle of the season to call Bray up to the majors or risk losing him.
The Nationals cut four pitchers, leaving Fernando Abad as a strong contender to make their bullpen.
As he tries to make the Nats as a lefty reliever, Bill Bray is still trying to regain his old mechanics.
Bray, 29, was the Montreal Expos first-round pick in 2004 and returns after six seasons with the Cincinnati Reds, hoping to making the roster as the bullpen's lefty specialist.