Bigge experienced renewed soreness with his right lat Wednesday and won't begin a rehab assignment Friday with Triple-A Durham as had been planned, Marc Topkin of the Tampa Bay Times reports.
Rays manager Kevin Cash said that Walls was scratched from the lineup for Wednesday's game against the Astros due to groin soreness, Ryan Bass of FanDuel Sports Network Sun reports.
Littell came away with a no-decision against the Astros on Tuesday, allowing two runs on seven hits while striking out six over five innings. He did not issue a walk.
Simpson (hand) had two stolen bases as a pinch runner and defensive replacement in Monday's loss to Houston. He reached base on catcher's interference in his lone plate appearance.
Pepiot did not factor in the decision during Monday's loss to Houston. He allowed three runs on eight hits and a walk over six innings while striking out two.
Kelly (glute) will begin a rehab assignment with the rookie-level Florida Complex League Rays on Tuesday, Ryan Bass of FanDuel Sports Network Sun reports.
Mangum (groin) will begin a rehab assignment with the rookie-level Florida Complex League Rays on Tuesday, Ryan Bass of FanDuel Sports Network Sun reports.
Rays manager Kevin Cash said Monday that Kim (shoulder) could begin participating in the rookie-level Florida Complex League by the end of the week, Ryan Bass of FanDuel Sports Network Sun reports.