The team said he will be seen by Dr. Chris Ahmad tomorrow in New York City and he will be shut down for the next 10 days before trying to throw again.
Pineda is currently suspended for 10 games for having pine tar on his neck during a game last week against the Boston Red Sox. His suspension is slated to end next Monday.
Pineda pulled himself out of a simulated game in Tampa after one inning and complained of soreness in a back muscle.
Pineda is 2-2 with a 1.83 ERA in four starts this season, with 15 strikeouts and three walks in 19 2/3 innings.
Pineda to be out 3-4 weeks, Yankees announce — Erik Boland (@eboland11) April 30, 2014