The Twins have signed left-hander Glen Perkins to a three-year, $10.3MM extension, the team announced. The SFX client was already under contract for $1.55MM in 2012, so the deal covers the 2013-15 seasons. It includes a club option for 2016.

“He has been a reliable reliever for us and has helped stabilize the back end of our bullpen in the set-up role," Twins GM Terry Ryan said.

Perkins, 29, posted a 2.48 ERA with 9.5 K/9 and 3.1 BB/9 in 61 2/3 innings last year. Pitching out of the bullpen, his average fastball velocity jumped to 93.8 mph.

Perkins' deal buys out his final season of arbitration eligibility and at least two free agent seasons. It includes incentives for games finished, according to MLB.com's Rhett Bollinger (on Twitter). Sean Marshall, a left-handed setup man with a stronger track record than Perkins, recently signed a three-year, $16.5MM extension with the Reds. MLBTR's Extension Tracker offers a complete look at recent extensions for lefty relievers.