"I know they're speaking to a number of managers, aren't they, and trying to bring in the right appointment," he said.
"I presume that's all you can do.
"They also spoken to a lot of high-calibre managers. It's just that we don't know about them.
"People are picking on Roberto Martinez and Brendan Rodgers.
"They're both wonderful managers and Roberto Martinez is a superstar - he's a friend of mine."