Lerner was reacting to the axing of Ian Culverhouse and Gary Carsa from Lambert's backroom team.
He said: "Our manager has been faced with some unexpected issues that could have very easily set the club back.
"In watching him handle matters, along with our chief exec, I've seen total loyalty and commitment to Aston Villa, while Gordon, a Villa man through and through, has repeatedly stepped up to support the club regardless of the ask.
"Shay, too, has been unhesitating in answering the manager's call. I couldn't ask for more from people who are up for this challenge and the very real obstacles we have to overcome, as is everyone at the club.:"
For breaking stories and all the great banter like us on Facebook: facebook.com/tribalfootball