PEORIA, Ariz. -- Health has been a continual obstacle for new Texas Rangers right-hander Andrew Cashner, his former pitching coach said on Saturday.

"When he was healthy with us, he was fantastic," said San Diego pitching coach Darren Balsley, who worked with Cashner from 2012-16. "He has pitched through a lot of things, whether it was the shoulder or the neck, the past few years. He's not the type of guy that's going to make an excuse."

Cashner is dealing with another physical issue, right biceps tendinitis, in his first spring with the Rangers. He has not yet appeared in a game. He has been on the disabled list six times in the previous six seasons.

"When he's close to 100 percent, he's as good as anyone out there," Balsley said. "I've seen him throw some gems."

Balsley shepherded Cashner through the change from relieving to starting. In 97 starts with San Diego, Cashner was 25-40 with a 3.63 ERA.

"He's a tremendous talent," Balsley said. "One of the most tremendous athletes I've ever worked with as far as arm strength. ... Very coachable person. Loves the game. When he crosses the line, he wants to get things done."