"The Cubs desperately want another starter at the deadline, targeting Mitch Keller of the Pirates, and would include outfield prospect Owen Caissie to make it work," Nightengale wrote on Sunday. Keller has previously been an All Star, and he would be a boost near the front of the Cubs' rotation.

The Chicago Cubs need to add a starting pitcher. They could look to buy low on a former Cy Young candidate from the Arizona Diamondbacks.