Exclusive by John Sinnott
Porto striker Benni McCarthy believes the club's coach Jose Mourinho will quit Portugal if the team win the Champions League in May.
McCarthy also hinted Mourinho, who has led Porto to the Champions League semi-finals, will next coach in England.
He told BBC Sport: "If Porto advance to the final then I think it's going to be impossible for Porto to keep Mourinho.
"Imagine him as a coach with Arsenal, Liverpool, or Chelsea, with a big budget. He would do wonders."
Porto's success in winning last year's Uefa Cup final against Celtic and their achievements during the current campaign have already seen Mourinho linked with Spurs and Liverpool as well Spain's Real Madrid.
Of the four Champions League semi-finalists, Porto are the only team capable of winning three trophies - their domestic league and cup as well as the European Cup.
Already in the Portuguese Cup final, Porto also lead the Portuguese premier league by four points and have a game in hand over second-placed Sporting Lisbon.
McCarthy said: "Mourinho is already in the books of many, many great clubs.
"He is a trainer with a lot of character and a brilliant man. As a coach he has proved himself at the highest level.
"He has taken to Porto to the semi-finals on a small budget and a small squad.
"Imagine him as a trainer with Arsenal, Liverpool, or Chelsea for that matter, where he would have much more of a budget and more big-named players. He would do wonders with those sorts of big teams.
"It's going to be a huge loss for Porto if he goes to a big team."
McCarthy also revealed Mourinho, for now, is solely focused on winning the treble.
"His plans are to win the League, the Portuguese Cup - and the sooner the better - and then concentrate on the Champions League.
"Of the four Champions League semi-finalists we are the only team that can still win three competitions. It's going to be as hard as hell, but we will do our upmost to do that."
If Porto complete the treble McCarthy also predicted the current team would break up.
He said: "It will be really, really difficult for the club if this team wins all those competitions to hold on to these players.
"I'm sure a lot of other big-named teams will come in for some of the players, giving them the chance to play in a bigger league.
"First we have to win everything so we can put ourselves in that situation."