Inter Milan midfielder Thiago Motta is desperate to see Deco arrive at Giuseppe Meazza this summer.
The Serie A champions' manager, Jose Mourinho, is understood to be keen on a reunion with Deco, a colleague from former club Porto.
Chelsea could be willing to sell, with the 31-year-old - who is under contract until 2011 - having fallen down the pecking order at Stamford Bridge following Luiz Felipe Scolari's exit.
And Motta is eager for his ex-Barcelona team-mate to arrive in Italy as Inter look to build a squad for success in the UEFA Champions League.
"When I played with him (Deco) at Barcelona, you had the best Ronaldinho while Lionel Messi was beginning to shine, but the reference point for everyone was Deco," said Motta in Gazzetta dello Sport.
"He is the most complete midfielder there is. He would be a fantastic reinforcement."
Motta has also called on striker Zlatan Ibrahimovic and full-back Maicon to stay at Inter.
The pair have both been linked with moves away, with Barcelona, Chelsea and Manchester City all rumoured admirers.
Motta said: "Ibrahimovic is one of the three best players in the world and Maicon is No. 1 in his role.
"They have to stay, but only if they are happy to stay. You can't play without a smile."