Last month, Marshall and Dolphins coach Tony Sparano wouldn't disclose the nature of the receiver's surgery. However, a source with knowledge of the situation confirmed to NFL.com senior writer Steve Wyche that Marshall had a "minor" hip procedure and should be healthy in plenty of time for training camp in July.
With Marshall working out Wednesday, that appears to be the case.
Marshall isn't a stranger to hip trouble. He had hip surgery before the 2009 season and has said he played with a hip tear in 2008.
The Dolphins acquired Marshall from the Denver Broncos in April in exchange for two second-round draft picks, then quickly got the receiver to agree on a four-year contract extension that could be worth as much as to $50 million. Marshall had 101 catches for 1,120 yards last season for the Broncos, including an NFL-record 21 catches for 200 yards during a December game against the Indianapolis Colts. The four-year pro has been selected to two Pro Bowls.
The Dolphins have three organized team activities remaining, then will take a break before training camp.
The Associated Press contributed to this report.