The team said Tuesday that the 21-year-old prospect is expected to make a complete recovery.
Mitchell was injured Friday while making a spectacular, against-the-wall catch on a drive off the bat of Juan Rivera in a split-squad win over the Angels.
The 21-year-old Mitchell is among the club's top prospects despite minimal experience in the minor leagues after being drafted out of Louisiana State. He batted .296 with 12 doubles, two triples and 10 RBIs in 34 games last year for Class A Kannapolis of the South Atlantic League.
MARLINS: Former All-Star closer Derrick Turnbow says his chances of making the team are "over" after he left Tuesday's game with severe shoulder pain.
Turnbow said he was sure he would "be shutdown for while." He walked one batter and hit another before walking off the mound with the team trainer. He will undergo an MRI today and said surgery was a possibility.
NATIONALS: First baseman Adam Dunn left Tuesday's split-squad game against the Marlins after two innings because of a spasm in his lower back and is day to day.
Dunn made an error in the second inning when he bobbled a grounder in the hole by Logan Morrison . Dunn flied out in the bottom half of the inning and left the game.
DODGERS: Former center fielder Willie Davis was remembered as an electrifying on-field presence and a larger-than-life personality in a memorial service at Dodger Stadium. Davis, 69, spent 14 of his 18 major-league seasons with the Dodgers.
- Reliever Cory Wade is expected to miss at least three months because he needs surgery on his right shoulder.
YANKEES: Hired former San Diego general manager Kevin Towers as a special assignment scout. Towers was fired by the Padres during the final weekend of the 2009 season after 14 years as their GM.