From the Star Tribune:

With their starting pitching staff in tatters, the Twins promoted top prospect Matt Garza to the big leagues Tuesday and sent Mike Smith back to Class AAA Rochester.

Garza was expected to join the team for Tuesday night's game against the Detroit Tigers. He likely will make his major league debut Friday, against the Toronto Blue Jays at the Metrodome, but the Twins had yet to say.

There were no updates on rookie All-Star Francisco Liriano, who is out indefinitely with what appears to be a left elbow injury.

Thanks to Batling Aurora for the heads-up!