Stratton (forearm) is expected to be healthy for the beginning of spring training, Anne Rogers of MLB.com reports.
The Royals placed Stratton on the 15-day injured list Saturday with a right forearm flexor strain.
Stratton (2-2) allowed five runs on four hits and a walk while striking out one over one inning to take the loss versus the Tigers on Saturday.
Stratton (2-1) did not allow a baserunner and struck out one batter over 1.2 innings to earn the win Wednesday versus the Blue Jays.
Stratton (1-1) allowed two runs on a hit and four walks without striking out a batter over one inning, taking the loss Sunday versus the Mets.
Stratton has allowed four runs on three hits and two walks while striking out two over two Cactus League innings.
Stratton signed a one-year, $3.5 million contract with the Royals on Tuesday, Anne Rogers of MLB.com reports.
The Rangers acquired Stratton and left-hander Jordan Montgomery from the Cardinals on Sunday in exchange for left-hander John King, infielder Thomas Saggese and right-hander Tekoah Roby, Jeff Passan of ESPN.com reports.
Stratton picked up the save in Wednesday's 6-4 victory over the Marlins, allowing a run on two hits while logging a strikeout over an inning.
Stratton has allowed two runs on seven hits and three walks over four innings across four Grapefruit League appearances.