The Yankees placed Paxton (forearm) on the 10-day injured list Monday.
Paxton's impending move to the IL had been expected for several days after manager Aaron Boone said the lefty would be shut down from throwing for at least two weeks due to a left flexor strain, but New York waited to make the transaction official until this week. New York has yet to announce a replacement in the rotation for Paxton, but the team's schedule will allow it to get by with a four-man rotation until Sept. 1.