LATROBE — Pittsburgh Steelers lineman Alejandro Villanueva has a chance to compete for one of the most important positions along the offensive line.

Villanueva, in just his second season, is locked in a tight training camp competition with veteran free agent acquisition Ryan Harris at left tackle, the blind side of Steelers star quarterback Ben Roethlisberger.

“For an undrafted guy like me, this is a best-case scenario, to be able to compete for a starting position coming into my second year,” Villanueva said. “Usually the draft or free agency brings in high-caliber players and I feel I can compete with players, but I just can’t compete with a salary.

“I’m thankful for the opportunity to at least get to compete.”

The Steelers signed Villanueva to their practice squad in 2014 after he was cut by Philadelphia as a defensive end. The team moved the 6-foot-9 Villanueva to left tackle as the former undrafted free agent and Army Ranger gained almost 100 pounds to play along the offensive line.

He made the team in 2015 as the swing tackle and was thrust into the starting role after Kelvin Beachum — now in Jacksonville — tore his anterior cruciate ligament six games into the season.

Villanueva stepped right in, starting the final 10 games.

“Al did a great job last year and he’s a guy who’s still learning so much,” offensive line coach Mike Munchak said of the 27-year-old Villanueva, who appeared in all 16 games.

“Al’s got so much upside and the more he plays, he just gets better every time he’s out there.”

Villanueva feels as if he’s grown substantially entering his second season. He took an important lesson from his first NFL start at left tackle — a loss at Kansas City — when he allowed a sack against Tamba Hali that clinched the victory for the Chiefs.

“Everybody makes mistakes, but one mistake can cost you the game Sunday,” Villanueva said. “You can play a great game, but if you give up a sack, it’s really ugly.”

Harris, a nine-year veteran, earned a Super Bowl ring last season, starting all 19 games at left tackle for Peyton Manning, Brock Osweiler and the Denver Broncos. The 31-year-old Harris signed a two-year contract with the Steelers as an unrestricted free agent in March.

“Ryan has a lot of experience and already knows a lot of the little stuff that Al’s learning because he’s been in the league and he’s been successful,” Munchak said. “He’s been through the ups and downs of the NFL.

“He was a Super Bowl champion and that brings confidence to your play and the people around you. He’s learned a lot over the years and he’s a nice addition to our group.”

The 6-foot-5, 302-pound Harris has appeared in 110 games, making 70 starts. Harris played for three different teams, including two stints in Denver.

“My perseverance has given me a lot of confidence, almost as much confidence as my Super Bowl ring,” Harris said.