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
A Middlesbrough teacher who was caught with indecent images of children and extreme animal pornography has been put behind bars.
Police were called to reports of a disturbance inside the Prince Edward pub on Wednesday night.
Northumbria Healthcare NHS Foundation Trust has been rated as 'outstanding' by the Care Quality Commission.