Shenton was optioned to Triple-A Durham on Tuesday, Tricia Whitaker of Bally Sports Sun reports.
Shenton went 2-for-4 with an RBI-double and a run scored in Sunday's 3-2 win over the Rockies.
Shenton went 0-for-3 with three strikeouts and a walk Monday against the Rangers.
Rays manager Kevin Cash said Wednesday that Shenton has made the Rays' Opening Day roster, Steve Carney of StPeteNine.com reports.
The Rays optioned Shenton to minor-league camp Monday.
The Rays selected Shenton to their 40-man roster Tuesday, Marc Topkin of the Tampa Bay Times reports.
Shenton was promoted from Double-A Montgomery to Triple-A Durham.