Liriano, an All-Star during his rookie year of 2006, is 7-0 with a 2.73 ERA over his past nine games. But he missed all of 2007 after undergoing Tommy John surgery and began the year in the big leagues by going 0-3 with a piss-poor 11.32 ERA, so its understandable why the team is being cautious.
Not to mention the fact that they don't need him. The team is currently 1.5 games behind the first place White Sox, in large part due to its rotation. Scott Baker, Glen Perkins, Nick Blackburn, and Kevin Slowey have anchored a rotation that also includes veteren Livan Hernandez. Of that group, Hernandez is the only one close to losing his spot, but he is an innings eater and has won nine games.
If and when the Twins decide to recall Liriano, he may be headed to the bullpen, according to ESPN.com.