The former South Africa striker was a boyhood Reds fan and scored twice against us for Porto in the 2003/04 Champions League knockout stages.
"I support Man United and always wanted to play for them," he once said. "I loved players like Mark Hughes, Andy Cole and Ryan Giggs."
The 44-year-old also represented the likes of Ajax, Blackburn Rovers and West Ham United during his distinguished career.
McCarthy left his post as AmaZulu head coach in March after guiding the South African team to a record second position in the league. In 2020/21, he was named the South African Premier League's Coach of the Season.