UNDATED (AP) — Yankees right-hander Chase Whitley will undergo season-ending Tommy John surgery on Tuesday. The 25-year-old Whitley left his start Thursday against Tampa Bay in the second inning because of pain in his elbow.

Whitley was 1-2 with a 4.19 ERA in four starts this season.

Injured Yankees pitchers Masahiro Tanaka and Ivan Nova continue their comebacks. Tanaka hasn't pitched since April 23 because of right wrist tendinitis and a right forearm strain. He threw a bullpen session Monday.

Nova is expected back next month, 15 months after Tommy John surgery.

Also in the majors:

— Detroit Tigers hurler Justin Verlander threw a 45-pitch bullpen session before Monday's game against Milwaukee. The right-hander says he'd likely need a simulated game and at least one rehab start before making his major league season debut. Verlander has not pitched because of a strained right triceps.

— The Cleveland Indians have activated utilityman Mike Aviles from the restricted list. Aviles was originally put on the family medical emergency list while his 4-year-old daughter was being treated for leukemia at the Cleveland Clinic. He is hitting .288 in 18 games for the Indians this season.

— Baltimore right-hander Bud Norris has been placed on the 15-day disabled list with bronchitis, a move that's retroactive to May 11. Norris is 1-4 with a 9.88 ERA.

— The Milwaukee Brewers have optioned second baseman Scooter Gennett to Triple-A Colorado Springs and recalled right-hander Corey Knebel. Gennett has hit .154 in 21 games for the Brewers this season.

— Atlanta Braves backup infielder Phil Gosselin will miss about eight weeks because of a fractured left thumb. The 26-year-old is hitting .325 with two RBIs in 40 at-bats after making the opening-day roster for the first time in his big league career.

— Troy Tulowitzki is back in the Colorado Rockies lineup after sitting out the last two games with tightness in his left quadriceps.