The left-throwing Leinart, the 2004 Heisman Trophy winner, played in only two games for the Texans after signing with them in September 2010. He finally got a chance to play after Schaub broke his right foot, but Leinart dislocated his left shoulder in the first half against Jacksonville on Nov. 27.
T.J. Yates replaced Leinart and guided the Texans to their first division title and playoff berth, though Yates struggled late in the season. McNair said the team is confident with Yates in the backup role, and may seek another quarterback in the draft.
Leinart thanked McNair and the team on his Twitter account.
"I will miss the Texans fans and most importantly my teammates," Leinart wrote. "I have no time to get down, focus is on getting healthy and being ready to go again!"
Vickers appeared in 14 games, but started only one in his only season in Houston. He played his first five NFL seasons with Cleveland.
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