The RMC commentator believes Mourinho has lost his "magic".
Riolo declared yesterday: "Jose Mourinho has been on a downward slope since 2010.
"He took his ascendancy between 2003 and 2010. After that, there are strokes of brilliance, but it's been all downhill. There is no more magic, there are teams that I do not understand.
"I do not understand this Manchester United team."