KEY POINTS
  • It won't be easy to replace Martin Sorrell at WPP, warned Egyptian billionaire Naguib Sawiris.
  • Sorrell "created a monster in advertising" and his success story will be "very difficult to replicate," Sawiris told CNBC's "Capital Connection."

The resignation of Martin Sorrell from his post as the chief of WPP is "a very sad event" and it will be a big challenge for someone to fill his chair, according to Egyptian magnate Naguib Sawiris.

"He's created a monster in advertising, he's created a success story that is very difficult to replicate," Sawiris, a billionaire who made his fortune building a telecommunications empire from the Middle East to South Asia, told CNBC's Capital Connection.