Kowar will be recalled from Triple-A Omaha to start Wednesday against Cleveland, Josh Vernier of 610 Sports Kansas City reports.
Kowar made his big-league debut in June and returned to the minors after surrendering 10 earned runs over five innings (three appearances), and he'll rejoin the Royals on Wednesday for another look. The 24-year-old hasn't been particularly effective at Triple-A since the demotion with a 5.14 ERA, 1.47 WHIP and 74:24 K:BB, though he's given up two runs with a 16:2 K:BB in his past two outings (11 innings).