Knowshon Moreno’s lack of production may be linked to a knee injury that might require surgery before the start of the 2014 season.

According to, NFL Media Insider Ian Rapoport reported that Moreno's lack of activity is due to his left knee, which has been bothering him this spring. It was sore yesterday, so the Dolphins had him take it easy -- it is not the knee in which he suffered a torn ACL in 2011.

Rapoport, citing a source who spoke to the player, reported that Moreno's knee did feel better than it had previously, however, arthroscopic surgery is possible. The running back plans to see a doctor in Miami next week to find out.

ProFootballTalk first reported that surgery was a possibility.

The South Florida Sun-Sentinel previously reported the knee problem as a vague "medical issue."

That medical issue means there is a chance Moreno goes under the knife just weeks before training camp opens.

Moreno signed a one-year $3 million contract with the Dolphins this offseason, $1.25 million guaranteed. They could have ended up buying damaged goods if the running back indeed needs surgery prior to the season.

Moreno was signed with the intention of becoming the starter in the Dolphins backfield. Last season the Dolphins opening training camp with Lamar Miller as the starter and Daniel Thomas as the backup. Both Miller and Thomas remain on the roster with Miller being listed as the starter with Moreno second on the depth chart, followed by Thomas. There had even been talk about Moreno becoming a third-down back for the Fins.

The surgery, if needed, will happen between now and the July start of training camp. The Dolphins will not hold practice or schedule any events for the team during that time period.