Aston Villa caretaker boss Scott Marshall says the Premier League club need a manager of proven ability to replace Paul Lambert.
Marshall said: "This is a big club and it's not somewhere for someone to cut their teeth."
First-team coach Marshall is likely to be in charge for Villa's FA Cup tie at home to Leicester on Sunday (12.30GMT).
He added: "It's certainly a big club and I would say there aren't many things which are going to prepare you for this experience, so I think a manager with experience is probably necessary."
Lambert was sacked after just two wins in 21 league games which left Villa in the relegation zone.
Former Arsenal defender Marshall, 41, previously worked with Lambert at Norwich City before he followed his fellow Scot to Villa Park.
"He brought me here and gave me a great opportunity to work at a great club," Marshall said.
"I'm hugely disappointed that it's not going to continue. I've spoken to him and he's obviously disappointed."