Lazio great Paolo di Canio says Inter Milan have moved forward since selling Andre Onana to Manchester United.
Inter now sit clear at the top of the Serie A table.
Di Canio told Sky Italia: "When Onana left, it seemed as if (Gigi) Buffon had gone, he's a goalkeeper who had a good season but who scored two ducks a game at Ajax, only that the opponents missed the goals.
"(Yann) Sommer has many appearances for the Swiss national team where he is the starting goalkeeper, he is a great player. (Benjamin) Pavard is a world champion, he has won everything as a protagonist, he is different from a footballer who pays 50 million and is a prospect.
"Inter are three years late, for me they were the strongest three years ago and then due to the inexperience of the coach and the players they did not manage to win. Last year's Champions League final, even though it lost against Manchester City, gave great motivation, this year it is bringing out everything because the team was already there three years ago, but now it has arrived to its full maturity.
"They are doing wonderful things."