The Giants placed Lee on the 10-day injured list Friday, retroactive to Tuesday, with a mid-back strain.
Lee hasn't played since making an early exit from Monday's contest with what was initially labeled as back spasms. Upon further evaluation, the Giants determined the 27-year-old had suffered a strain, so they'll stash him away on the IL for at least a week. Will Brennan is a candidate to receive the bulk of starts in right field as long as Lee is sidelined, and Victor Bericoto will come up from Triple-A to replenish the big club's outfield depth.