LeBlanc, 30, who was 10-3 with a 4.00 earned-run average in 21 starts at Salt Lake, is expected to take Richards' rotation spot and start against the Miami Marlins on Monday night in Anaheim.
The Angels, who needed 7 1/3 innings from their bullpen in Wednesday night’s 8-3 win over the Red Sox, also recalled right-hander Cam Bedrosian to bolster the bullpen after demoting outfielder
Richards, who injured the patellar area of his left knee covering first base in the second inning Wednesday night, was undergoing an MRI test in Los Angeles on Thursday.
His 2014 season appears over, and there is a good chance he will need surgery to repair his patellar tendon, a procedure that requires a three-to-six-month recovery.
LeBlanc has a 20-32 record and 4.56 ERA in the big leagues and has pitched only 7 1/3 innings in the majors this season, 6 1/3 of them coming for the Angels in a May 30 game against Oakland. His other inning came for the