"I know he's got a good arm, a plus arm," Cardinals manager Mike Matheny said on Saturday afternoon. "I don't know a whole lot about him besides that. It's just another opportunity to bring someone in and see if we can help him and see if he can help us."
The 27-year-old, who was added to the 40-man roster, had a 6.75 earned-run average in four games with the Cubs last September.
He allowed two earned runs on two hits, struck out three and walked two in 2 2/3 innings. In his final three appearances, covering 1 1/3 innings, he allowed one hit, struck out two and walked one.
In 21 Triple-A appearances this season -- 16 with Durham (Tampa Bay organization) and five with Round Rock (Texas) -- Gaub went 0-1 with one save and a 3.43 ERA over 21 innings. He allowed eight runs on 13 hits, struck out 25 and walked 14.
Gaub was originally a 21st-round pick (641st overall) by the Cleveland Indians in the 2006 Draft. He was acquired by the Cubs, along with two other players, in a deal for Mark DeRosa in December of 2008. He was acquired by Tampa Bay on April 5 on a waiver claim from the Cubs and then acquired by Texas on May 24 on a waiver claim from the Rays.