PITTSBURGH (KDKA) - The Penguins will be without one of their offseason acquisitions for the next 6-8 weeks, at least. 

The team and President of Hockey Operations Kyle Dubas announced on Thursday afternoon that forward Matt Nieto underwent successful knee surgery. 

The 31-year-old forward underwent laparoscopic surgery to his right knee and the recovery time is expected to be 6-8 weeks. 

So far this season, Nieto has scored one goal and three assists for four points in 22 games. 

The Penguins signed Nieto this summer to a 2-year deal. 

They'll be back in action tonight in Boston as they take on the Bruins.