Clooney plays an aging star in what passed for a football league in the 1920's. It was a small league of teams in the American Mid-West. Trick plays and all kinds of stunts were fair game in this brand of football. Rules were scarce and unfortunately for the team sponsors so were the fans. The league folded and all the players had to find regular jobs.
In comes John Krasinski (The Office) as a returning World War 1 War Hero. Clooney sees him as the guy young athletic hero who can bring respectability to the game of football and put him and the others back to work. Unfortunately, Krasinski's war exploits were quite overblown and Zellweger as a reporter was on his trail to expose him.
So there you have it. Clooney is out to use Krasinski to save football and Zellweger is out to expose Krasinski as a fraud war hero for her paper so she can get a promotion.
If you like sports and old time movies you'll probably like this one. Otherwise I'd steer clear of it. The plot meanders all over the place and the movie lacks action. Still if you can follow the twists and turns you are rewarded with the scene of both Clooney and Krasinski trying to woo Zellweger in a film set in the twenties and thirties with plenty of sight gags and one-liners.
