"He's been winging it pretty good," manager Ron Gardenhire said before Wednesday's game against Cleveland.
Liriano is 14-8 with a 3.44 ERA in 29 starts, including 6-1 in his past 10. The left-hander will have six days' rest between his final regular season and first playoff starts.
Minnesota clinched its second straight AL Central title -- and sixth in nine years -- late Tuesday. Unlike last year, when Minnesota was involved in a tiebreaker playoff to win the division, the Twins can set up their rotation.