A career .226 hitter in six minor league seasons, Rojas is best known for his glove work, which earned him the award for "Best Defensive Infielder" in the Cubs' farm system by Baseball America in 2004.
"He's a glove guy that's not going to be known for his offense," Cubs Minor League Infield/Bunting Coordinator Bobby Dickerson explains. "But he can change the game with his defense."
Rojas was signed by Cubs scout Hector Ortega as a non-drafted free agent from Venezuela in 2001. In a corresponding move, Tennessee placed first baseman Brian Dopirak on the disabled list Wednesday. Dopirak is currently nursing a sprained thumb, Cubs Farm Director Oneri Fleita said.
In Daytona, LHP Darin Downs was added to the Cubs' Class High-A roster after joining the club from Extended Spring Training in Arizona on Monday.
Downs, a fifth-round Cubs draft pick in 2003, made 11 appearances between Class Low A Boise and the Arizona Rookie League a season ago.
The left-hander underwent ulnar nerve transposition this past off-season after having suffered from Cubital Tunnel Syndrome.
To coincide with the move, RHP Todd Blackford was placed on the DL.
In Peoria, Rafael Dolis was placed on the disabled list Wednesday. The right-hander was 3-1 with a 1.80 ERA in six starts.
Right-hander Mike Billek, a third-round pick from Central Florida in the 2005 draft, was added to the Peoria roster from Extended Spring Training. He was plagued this spring by shoulder tendonitis.