The 33-year-old Marquis had a tough start to his 13th Major League season, pitching to a 2-4 record and 8.47 ERA in seven starts. He began the season by winning his first two decisions, but then dropped four consecutive starts from May 5-20.
Marquis allowed 20 earned runs over his last 16 2/3 innings (10.80 ERA) with 12 walks and just five strikeouts. His last outing with the Twins came on May 20, when he surrendered eight earned runs in 1 2/3 innings against the Brewers.
Marquis, who signed a one-year deal with the Twins during the offseason, returns to the National League, where he spent the first 12 seasons of his career and was an All-Star in 2009 with the Rockies.
Marquis has gone 106-102, with a 4.63 ERA and 986 strikeouts in 333 career appearances.
Jon Star is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.