SANTA CLARA, Calif. — Beleaguered quarterback Alex Smith got a vote of confidence today from the San Francisco 49ers, who exercised a multimillion-dollar buyback clause in the former No. 1 draft pick's contract that essentially extends his deal through 2010.

Smith, who floundered through injuries and a prolonged public argument with coach Mike Nolan last season, will compete with former third-stringer Shaun Hill and likely another veteran quarterback in training camp. But general manager Scot McCloughan showed the 49ers' feelings about Smith by overriding the language in Smith's contract that could have allowed him to become a free agent after next season by voiding the final two years of his deal.

"It just shows that we believe in him to be our guy," McCloughan said. "He and Shaun are going to go out there and compete, and the winner of that is going to be a good quarterback for us."

McCloughan declined to say how much the move cost the 49ers, though he said the overall deal was similar to the move made last season by the New York Giants, who bought back two voidable years in quarterback Eli Manning's contract for a reported $5 million bonus.

Smith has started 30 games in his three seasons with San Francisco, passing for 4,679 yards, 19 touchdowns and 31 interceptions while getting sacked 81 times.

His career passer rating is 63.5, but the former Utah star played while injured last season before undergoing surgery on his separated right shoulder in early December. Smith is scheduled to meet with Dr. James Andrews in Birmingham, Ala., next week with hopes of being cleared to resume throwing.

McCloughan isn't certain who will compete with Smith and Hill for the starting job, but it's unlikely to be Trent Dilfer. The 14-year veteran hasn't officially retired, but McCloughan anticipates meeting soon with Nolan and Dilfer, whose season ended in December with the last of several concussions.

McCloughan said he hadn't spoken to 11-time Pro Bowl guard Larry Allen since the 49ers' fifth consecutive losing season ended. Allen, who isn't under contract as he contemplates retirement, isn't expected to decide his future until close to training camp.

"If he wants to stick to the price we think he's worth, we'd love to have him back," McCloughan said.

McCloughan also warned fans not to expect the same excitement generated by the club during the NFL's free-agent signing period last season, when they inked cornerback Nate Clements and safety Michael Lewis to lucrative deals in the opening hours. McCloughan confirmed the 49ers are most interested in bolstering their defensive line.

"We don't feel like we have to go out and make a big splash right away," McCloughan said. "The thing worked out for us last year. We knew exactly what we wanted, we knew how to get it done, and we got it done. ... We don't consider ourselves a free-agency team. We want to do most of our damage through the draft and help our own guys, but (free agency) is a tool we want to use hopefully less and less as we go into the future."