The Blue Jays have not confirmed or commented on the report.
The 33-year-old Wang had been pitching for Triple-A Scranton/Wilkes-Barre of the Yankees system but was granted his release in order to pursue an opportunity at the big league level.
Wang went 4-4 with a 2.33 ERA in 58 innings for the RailRiders. He also pitched 12 scoreless innings in this year's World Baseball Classic.
The native of Taiwan appeared in 10 games for the Nationals last season and posted a 6.68 ERA in 32 1/3 innings. He made five starts.
Wang has spent parts of seven seasons in the Major Leagues, five of them with the Yankees. His best years were in 2006-07, when he won 19 games each season while posting ERAs below 4.00 in the hitter-friendly American League East.
Injuries derailed what previously had been a promising career. Wang injured his right foot running the bases in an Interleague game in Houston in 2008 and then suffered a right shoulder injury during the 2009 season and was forced to miss all 162 games the following year. He returned in 2011 but so far has been unable to regain his previous form.
Tuesday's start in Chicago originally was expected to be taken by right-hander Chad Jenkins. The 25-year-old recently had his turn skipped in the rotation because of two Blue Jays' off-days this week and he was optioned to Triple-A Buffalo to remain stretched out.
The signing of Wang has yet to be made official but when it is, the Blue Jays will need to make a corresponding roster move in order to create space on the 40-man roster.
Gregor Chisholm is a
reporter for MLB.com. Read his blog, North of the Border,
and follow him on Twitter @gregorMLB. This story was not subject to the approval of Major League Baseball or its clubs.