Romagnoli played with Higuain during his loan spell at Ac Milan before joining Chelsea on loan last month,
However, the Chelsea striker has scored a brace in Chelsea’s 5-0 victory over Huddersfield Town last weekend.
“I still think he [Higuain] is the best striker in the world,” Romagnoli was quoted by Calciomercato as saying.
“I am sorry he decided to leave AC Milan but we respect his decision. He is a friend of mine and if he is happy I am ok with it.
“Now we have other players that won’t make us regret his departure.
“We enjoy having him here and we hope he can keep scoring at least one goal per game.
“Piatek’s impressed me with his desire and hunger. You can see he wants to show what he’s all about and that’s important. He’s young and on the right path.”