The 21 year-old has yet to score in Russian Federation and watched Firmino come off the bench to claim Brazil's second goal in their 2-0, last-16 win over Mexico.
The Colombian defender is being tipped to leave Barcelona this summer after failing to impress there.
"Paulinho and Coutinho are great players, and friends".
Recently, Willian who is now in Russian Federation for the World Cup has been linked with a move away from Stamford Bridge with Barcelona also interested in his signature.
The report claims that Chelsea are looking at around £60m from Barcelona if they are to let Willian join the Catalan giants.
"People speculate a lot". I've heard about rumours linking me with a move but now is not the time to talk about it. I've not received any information about that.
The 25-year-old would also strengthen our midfield next season given that he can take up a more attacking role and we can push Barcelona to pay a decent amount as part of the deal to take Willian.
Chelsea FC ended up in fifth place in the Premier League last term but managed to end the campaign on a high by beating Manchester United in the FA Cup final back in May.
And Willian had praise for the forward, saying: "Coutinho has been playing a wonderful World Cup, and he helps us a lot".
I think that Barcelona should offer two players, Gomes and Rafinha in order to bring Willian to the Camp Nou.