Cubs starter Zambrano to have shoulder scan

Chicago Cubs' Carlos Zambrano pitches during the first inning of their interleague baseball game against the Tampa Bay Rays in St. Petersburg, Florida June 18, 2008.

ST. PETERSBURG, Florida (Reuters) - Chicago Cubs starting pitcher Carlos Zambrano will undergo an MRI scan on his right shoulder on Friday and is expected to miss his next scheduled start on Tuesday against Baltimore.

Zambrano left Wednesday's game against Tampa Bay because of discomfort in the throwing shoulder and flew back to Chicago.

"I hope it's not serious," Cubs manager Lou Piniella told reporters. "We're not looking at Zambrano at all for Tuesday."

Zambrano is 8-3 with a 3.13 ERA in 16 starts this season.

(Writing by Jahmal Corner; Editing by Ed Osmond)