CHICAGO -- One of the tasks for the Cubs this offseason was to add an impact arm to the starting rotation. The North Siders appear to be closing in on Japanese free-agent Shōta Imanaga to check that box. On Tuesday night, a source told MLB.com that the Cubs were working

On Tuesday night, a source told MLB.com that the Cubs were working toward an agreement with Imanaga. The expected multiyear contract is pending a physical and there are still details to be ironed out before the left-hander’s 45-day posting window closes at 4 p.m. CT on Thursday.

The Cubs have not confirmed an agreement, which was reported by MLB Network insiders Jon Morosi and Jon Heyman as well as USA Today’s Bob Nightengale.