Nationals general manager Mike Rizzo reported Sunday that Harper has a "significant bone bruise" in his left knee but that he avoided any ligament damage, Gabe Lacques of USA Today reports. Harper was placed on the 10-day disabled list.
Harper will undergo an MRI on Sunday as the Nationals look to assess the severity of the hyperextended left knee he suffered in the first inning of Saturday's 3-1 win over the Giants, Jamal Collier of MLB.com reports.
McLemore suffered a non-displaced fracture of the fifth metatarsal in his right foot during a pick-up game in Los Angeles and will be sidelined for 12 weeks after undergoing surgery Tuesday, Chris Herrington of The Memphis Commercial Appeal reports.
Gallinari was diagnosed with a fractured right hand Sunday after suffering the injury while throwing a punch during an exhibition game with the Italian national team, EuroHoops.net reports. He's expected to require a 3-to-4 weeks to recover from the injury.
Richardson (leg) is encouraged by his progress from a fractured tibia and fibula in his right leg -- a devastating injury that he sustained in a game against the Canucks last November -- and he's looking forward to training camp.