Although he impressed coach Gary Kubiak at the Houston Texans' rookie minicamp last weekend, Heisman Trophy finalist Collin Klein remains unsigned after the team decided not to offer the former Kansas State quarterback a contract, ESPN.com reported Tuesday. Klein, who finished third in last year's Heisman Trophy voting, insisted on working out only at quarterback in advance of the NFL draft despite an unorthodox throwing motion, passing up the opportunity for scouts to look at him at tight end or receiver.

Klein went undrafted after an impressive final season at Kansas State. He accepted a tryout invitation from the Texans shortly after the end of the 2013 NFL Draft.

"I don't want to get too far ahead of myself, but to watch how far the guy came in two and a half days ... probably had his best day out there today," Kubiak told reporters Sunday. "He's found a way his whole career, and he's probably gonna find a way this time, too. He's done a good job."

The Texans currently have four quarterbacks on their depth chart, led by starter Matt Schaub. Others include T.J. Yates, Stephen McGee and Case Keenum, who went undrafted in 2012 and spent the entire season on Houston's practice squad.

"For what he did in college and what Jake has been doing with him, he's come a long way as far as working under center and stuff," Kubiak told reporters, according to the Texans' website. "The arm strength is there. The delivery's a little different, but you work with that. His instincts as a football player, you can't coach, the way he just takes off and stuff like that."

Klein told KRIV-TV in Houston that he was grateful to get the chance to try out. "I feel very good that I put my best foot forward and just so grateful they gave me the opportunity," he said.

During his senior season at Kansas State, Klein threw for 2,641 yards and 16 touchdowns, while completing 64.8 percent of his passes. The dual-threat quarterback also ran for 920 yards and 23 touchdowns.