The Brazilian defender was linked with a move to Wolves during the summer transfer window.
Costa was one of five past-and-present Benfica players to arrive at Molineux during the summer transfer window, alongside Silvio, Ola John, Ivan Cavaleiro and Joao Teixeira.
And centre-back Luisao could have also been plying his trade in the Championship if reports are to be believed. However, nothing came of the speculation and Wolves re-signed Richard Stearman instead.
At 35 - and six years Stearman's senior - there were naturally some concerns among Wolves fans regarding the Brazilian's arrival. Costa, though, does not believe that age would have been an issue.
"We’re talking about a player who’s having a fantastic career and who has been Benfica’s captain for many years. Luisão would certainly get easily into any team, for his stature and also for the leadership he has on the pitch," the 22-year-old said, as quoted by Sport Witness.
"For me, 35 is only a number. From what I’ve seen, Luisão has been very good and could still give a lot for that team. He’s a role model for the youngsters.
"See Ricardo Carvalho. I had the opportunity to play with him at Monaco… At 37, 38 years he showed he still has a lot of quality, no wonder why he went to the Euro and helped Portugal to win it. Age is just a number. He have to play as long as the legs allow us to, that’s what matters."
It's fair to say Wolves' continental revolution has gotten off to a slow start, with Walter Zenga's side currently 12th in the Championship.
That is, however, perhaps understandable given the amount of changes implemented at Molineux over the summer.
As well as new owners Fosun International and manager Zenga, a total of 13 players arrived through the door between 1 July and 31 August.