Jose Mourinho was appointed as United boss in May 2016, winning two major trophies in his first season.
The 55-year-old finished second in the Premier League last season while also losing the FA Cup final to Chelsea.
But it’s for their terrible displays this season the former Chelsea boss has lost his job.
United are currently sixth, 19 points off leaders Liverpool and 11 points behind chelsea in fourth.
A club statement read:
“Manchester United announces that manager Jose Mourinho has left the club with immediate effect.
“The club would like to thank Jose for his work during his time at Manchester United and to wish him success in the future.
“A new caretaker manager will be appointed until the end of the current season, while the club conducts a thorough recruitment process for a new, full-time manager.
Both assistant coach Michael Carrick or academy boss Nicky Butt won’t be the caretaker-manager to replace Mourinho according to SkySports.