Arizona Diamondbacks outfielder Cody Ross underwent an MRI on his ailing left calf yesterday to determine the extent of his injury, according to Steve Gilbert of MLB.com.

While Ross says the discomfort is in his left calf, the Diamondbacks have termed the injury as "lower left leg tightness," according to Nick Piecoro of The Arizona Republic.

Whatever the case, the ailment caused Ross to be scratched from Friday's spring training contest. After an off day Saturday, the outfielder returned to action on Sunday, but he had to be removed after three innings due to continued discomfort in his lower leg.

The Diamondbacks do not consider the injury to be serious, as manager Kirk Gibson told reporters that he's not concerned that it's only tightness. The extent of the injury should be determined later today when the results of the MRI are released.

The Diamondback signed Ross to a three-year, $26 million contract this offseason. The 32-year-old was added while Justin Upton and Chris Young were traded.

Ross spent the 2012 season with the Boston Red Sox. He hit .267/.326/.481 with 34 doubles and 22 home runs over 528 plate appearances. In nine seasons in t he majors he owns a career batting line of .262/.324/.460.