A backup for the Titans, Smith played in only three regular-season games with one start. He has not gotten on the field since 2012.
Smith has completed 23 of 45 passes for 234 yards, no touchdowns and four interceptions.
Manning had arthroscopic ankle surgery earlier this month and is sidelined for another few weeks. Painter underwent arthroscopic surgery on his right knee last Friday and recovery time is approximately four weeks.
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