Aston Villa have announced that Kevin MacDonald is to leave the club.
MacDonald, 51, first joined Villa in 1995 and has worked successfully as reserve-team manager as well as briefly acting as caretaker for the senior team following the departure of Martin O'Neill in 2010.
He had also been first-team coach during Alex McLeish's reign but, following the appointment of Paul Lambert as the club's new manager, MacDonald is to move on.
"I've had an incredible 17 years at Aston Villa, one of the biggest clubs in the country, and wish to thank all the staff and players I have worked with during my time at the club," he said. "I wish Aston Villa every success in the future."
Chief executive Paul Faulkner added on the club's official website: "As a club, we are immensely grateful for the contribution Kevin has made in more than 17 years at Villa.
"He has been an integral part of the success we have enjoyed at the academy and reserve team level and, in assuming his caretaker responsibilities at the beginning of the 2010-11 season, he cemented his position as a man who will always command respect at this club.
"The whole of Aston Villa Football Club will wish Kevin well."