Astros manager Joe Espada said that Whitley (knee) is "a possibility" to be activated from the 15-day injured list during the team's three-game series with the Rays that begins Monday, Matt Kawahara of the Houston Chronicle reports.
The Astros added Walter to their taxi squad Monday and could call him from Triple-A Sugar Land to start Tuesday's game against the Rays in Tampa, Chandler Rome of The Athletic reports.
Manager Joe Espada said Sunday that Alvarez is improving every day but is still feeling the muscle strain in his right hand that landed him on the injured list May 5, Chandler Rome of The Athletic reports.
Manager Joe Espada announced after Sunday's win over the Rangers that Wesneski (elbow) will undergo Tommy John surgery this week, Matt Kawahara of the Houston Chronicle reports.
Blanco (3-4) was charged with the loss Saturday, giving up three runs on five hits and three walks over six innings in a 5-1 loss against the Rangers. He struck out five.
McCullers came away with a no-decision in Friday's 6-3 win over the Rangers, allowing two unearned runs on four hits and a walk over four innings. He struck out two.