Matt Garza is being strongly pursued by the Rangers, Cardinals, Pirates, Indians, Blue Jays and Dodgers as the trade deadline nears.
A number of other clubs are also interested in acquiring Garza from the Cubs.
Major League executives view Garza as a middle of the rotation player, which makes it hard for teams to part with a top level executive for the right-hander.
"The big question about Garza is, 'Are you getting the guy who just pitched beautifully for five starts or are you getting the guy who has been on the DL three times in the last three years?'" a National League scout added.