The former Rosanero striker has scored seven goals in his first eight games for Napoli who he joined in the summer.
"We are talking about a real champion because he has everything," said Foschi. "Cavani has sensibility in his feet, tactical intelligence, a willingness to sacrifice himself and professionalism.
"I'd had our chief scout follow him many times. I received a series of DVDs from one of his agents, Triuzzi. The relationship was enthusiastic.
"We kept an eye on him at the Under-20 World Cup where he shone with Pato. But honestly it was Cavani who had a higher value.
"While we asked about him, Capello and Baldini were launching an offensive from Real Madrid. I knew about it and I stopped any delay.
"I have never regretted that purchase and neither will Napoli. They paid a lot for him. I believe his desire to stay in Italy counted a lot.
"I know for certain that in England they were ready to pay a sack-load of cash."