Wilson and Diekman were available for Friday night's series opener against the San Francisco Giants, as was catcher/first baseman Chris Gimenez after his contract was selected from Triple-A Round Rock.
The Rangers received Wilson on a waiver claim from Tampa earlier Friday. Diekman was part of the trade that also brought ace left-hander Cole Hamels from Philadelphia.
Hamels won't be added to the roster until Saturday, when he is scheduled to make his Rangers debut. Texas will then have to make room for newly acquired reliever Sam Dyson from Miami.