Jimmy Fallon has raised the stakes in the NHL's Eastern Conference final.

The late night talk show host and the Montreal Canadiens agreed to a bet over Twitter on Friday night based on the outcome of the Habs best-of-seven playoff series with the New York Rangers.

If Montreal wins the series and advances to the Stanley Cup final, Fallon will wear a Canadiens jersey during one of his monologues on The Tonight Show. If New York wins, the Habs will change their Twitter avatar to a picture of Fallon's choosing and Youppi, the team's mascot, will have to wear a Rangers jersey and have 10 photos of it taken around Montreal.

"We have a deal! It's on. I want Youppi on the mechanical bull at Chez Serge," Fallon said from his verified Twitter account, adding the hashtags #enjoytheseries #whatsyourjerseysize.

The Tonight Show is filmed at 30 Rockefeller Plaza in Manhattan, near Madison Square Garden, the home of the Rangers. Fallon is a native of New York City, having been born in the borough of Brooklyn.

The New York Rangers backed up Fallon online.

"We got you @jimmyfallon! #NYRPlayoffs" tweeted the official Rangers account.

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