What happened between Jon Lester and Chris Bosio

Jon Lester stirred up a lot of commotion in Thursday’s 13-10 loss to the Reds.

Lester, who allowed nine runs through 1 2/3 innings of pitching, left the game in the second after signaling to the trainer.

Although he didn’t show any physical signs of pain, Lester was scheduled to see the team physician after the game to determine the severity of damage to the large muscle that extends up from the back into the shoulder area.

But what fans really wanted to know was what really went down between Lester and Chris Bosio after the starting pitcher left the game.

Watch the confrontation from CSN’s Cubs Postgame Live show below:

David Kaplan said Friday on ESPN 1000 that last year’s Cy Young Award finalist was expressing frustration with the Cubs defense, and it wasn’t meant to be directed at Bosio.

Lester was placed on the 10-day disabled list Friday morning.