SATURDAY: Lannan has accepted the assignment, ESPN's Adam Rubin tweets.

WEDNESDAY: The Mets have outrighted left-hander John Lannan to Triple-A Las Vegas and purchased the contract of right-hander Daisuke Matsuzaka, tweets MLB.com's Anthony DiComo. Lannan will have the option to reject the outright assignment in favor of free agency. ESPN New York's Adam Rubin tweets that Matsuzaka will work out of the bullpen for now.

Lannan, 29, appeared in five games for the Mets this season, allowing seven earned runs on seven hits and a pair of walks in four innings of work. Of those seven hits, three cleared the fence for a home run. The veteran has never pitched outside of the NL East, but he's donned the uniform of three teams in that division: the Mets, the Phillies and the Nationals. After posting a 4.01 ERA in 783 2/3 innings with the Nationals from 2007-12, Lannan has struggled. With Philadelphia and New York, he's managed a combined 5.86 ERA with a 40-to-29 K:BB ratio in 78 1/3 frames.

Matsuzaka spent some time with the Mets in 2013 after signing a minor league deal midway through the season. He started slow but fared well down the stretch, yielding just four earned runs over his final 26 1/3 innings while striking out 21 and walking nine. Matsuzaka then signed another minor league deal with the Mets this winter. He's allowed two runs and punched out 12 hitters in 12 Triple-A innings this season. Matsuzaka's minor league deal calls for a $1.5MM base salary in the Major Leagues, and he also received a $100K retention bonus at the end of Spring Training after he did not make the Opening Day roster.