New England Patriots tight end Rob Gronkowski underwent successful back surgery yesterday afternoon, according to Ian Rapoport of NFL.com.

The procedure was performed by Dr. Robert Watkins in California. Watkins was the surgeon who performed Gronk’s pervious back operation.

Gronkowski entered the offseason nursing a broken forearm injury that was suffered and then aggravated toward the end of last season and in the playoffs. As his forearm issue was coming to an end, it was reported that the tight end was also dealing with a back injury.

Back troubles sidelined Gronkowski for a full season during his time at Arizona, and there were health concerns surrounding him when he entered the NFL. Still, at this point there’s growing optimism that Gronkowski will be back before the end of the preseason, according to Mike Garafolo of USA Today.