Middlesbrough Football Club confirmed this evening that Tony Mowbray has left the club with immediate effect.
Assistant manager Mark Venus will take charge of the team until further notice.
In a brief statement, Middlesbrough FC paid tribute to its former captain, who had returned as manager in 2010:
The club would like to place on record their sincere thanks to Tony Mowbray for all of his substantial efforts, dedication and integrity. He leaves with the very best wishes of all at the club.
More top news
Three men have been jailed for a total of 26 years after the court heard how they terrorised vulnerable drivers in Newcastle.
The six-year-old from Newcastle has thanked strangers who paid for his cancer treatment so he could be here to meet his younger sibling.
County Durham topped the list with the highest number of complaints investigated by the RSPCA last year, totalling over three thousand.