Aston Villa boss Martin O'Neill has sensationally resigned just five days before the start of the new Premier League campaign.
Reserve team manager Kevin MacDonald has been placed in caretaker charge at Villa Park while the club searches for a new permanent appointment.
Chief executive, Paul Faulkner, told Villa's official website:"The club would like to thank Martin for the great work he has done at Aston Villa over the past four years.
"He has helped to establish the club in the upper echelons of the Premier League, has taken us to Wembley and we have also qualified for European competition for the past three seasons under his management. We wish him the best in the future."
O'Neill added:"I have enjoyed my time at Aston Villa immensely. It's obviously a wrench to be leaving such a magnificent club.
"I would like to pay tribute to the Villa players, my coaching staff and the Villa supporters for all the support and encouragement they have given both the club and me personally during my time as manager. I wish them all the best for the future.
"I will obviously be assisting the club in the immediate short term with regard to the handover of my duties."
O'Neill cut his managerial teeth at Wycombe Wanderers before, after a brief and unhappy stint sat Norwich City, enjoying success at Leicester City and then Celtic.
He was appointed Villa boss almost exactly four years ago but his resignation comes at a time when James Milner appears to be on the verge of being sold to Manchester City.