Volquez missed all of last season after undergoing Tommy John surgery in August 2017. The right-hander went 3 2/3 innings in Thursday's 11-4 victory over the Angels and has allowed two runs, four hits, four walks and three strikeouts.
The 35-year-old Volquez, who pitched a no-hitter with the Miami Marlins in 2017, had no record in two starts with a 7.04 ERA. Manager Chris Woodward said Volquez told him before the game that something didn't feel right but he could pitch.
"He said nothing was painful, but he didn't feel right. The only pitch that didn't work was his curveball," Woodward said. "You could tell something wasn't right, though. His velocity was down, and he had erratic fastball command. He gave us almost four when almost anyone would have bowed out after a third of an inning."
Woodward said that Adrian Sampson was a possibility to move into the rotation. The right-hander went six innings in relief against Houston on Monday and allowed one run and four hits in a loss.
Bird was on the Rangers' Opening Day roster and made two appearances in the opening series against the Cubs. The left-hander went an inning in both games and didn't allow a run.