The Senegal ace has been linked with Real Madrid.
"I think Africa has the potentials to challenge top players around the world for the huge transfer record deals," Sule, now an agent, said to Goal.
"We had back in the days' players like Jay-Jay Okocha, Samuel Eto'o and others who made big money transfer moves. I believe we have some quality players who could still make such a move.
"He (Mane) has raised his game at Liverpool and value in the last two seasons. He's currently in the form of his life and stands a big chance also to seal a massive deal."