Football: Rooney upsets Adidas by wearing Nike

Manchester United captain Wayne Rooney has upset the club's new sponsors Adidas by wearing a Nike shirt. Photo / Facebook.

Manchester United captain Wayne Rooney has upset the club's new sponsors Adidas by wearing a Nike shirt.

On the same day Adidas started their record breaking £750 million shirt deal with the English giants, Rooney posted a picture on his Facebook page wishing happy birthday to United's new signing Bastian Schweinsteiger.

The pair both appeared in the picture wearing the club's old Nike training shirt.

Rooney is personally endorsed by Nike and Adidas officials are reportedly unhappy with the timing of the picture he uploaded.

The England captain celebrated Schweinsteiger's 31st birthday with the caption: "Happy Birthday to Bastian Schweinsteiger. Have a good day mate!"

A source quoted by The Sun said: "A lot of the lads marked the day but Wayne obviously didn't get the message. The Adidas guys weren't too happy."

Break Expectations. It’s what @manutd do. #BeTheDifference pic.twitter.com/6qSNetSkJx

— adidas UK (@adidasUK) August 1, 2015

Built to break expectations. The 2015/16 Manchester United home jersey. #BeTheDifferencehttps://t.co/mUuIpdSrd0

— Manchester United (@ManUtd) July 31, 2015

Life as Manchester United's new shirt sponsor hasn't been ideal for the German sportswear giant, who've already been under fire for releasing a new home shirt that's been branded as "sexist" and "discriminatory".

An Adidas spokesperson had to release a statement defending the female design.