Porto have developed a reputation down the years for lifting players to stardom before selling them off at enormous prices.
Hulk and Radamel Falcao are two of those who have come through the Estadio do Dragao on their way to big money moves elsewhere.
Following on from the hysteria surrounding AS Monaco-bound pair James Rodriguez and Joao Moutinho last season, a new duo have emerged as Porto’s most wanted this term.
Centre-back Eliaquim Mangala and striker Jackson Martinez have drawn the attention of Europe’s elite - top clubs the continent over pining away for their signatures.
Mangala slipped through Manchester City’s fingers in January and Martinez’s agent recently denied reports his client will join AS Roma - so both appear available to fill key needs at Old Trafford and the Emirates, respectively.
But a new twist has emerged in the situation that if genuine, could see only one of the Premier League giants get their man.
On Thursday, O Jogo declared that Porto president Pinto da Costa is willing to sell only one of his crown jewels this time around - either Mangala or Martinez.
Porto have endured a sordid campaign by their standards and will go without silverware for the first time since the 2004-05 season, so seem keen to minimise turnover.
This means that Arsenal and Manchester United may be in direct competition to sign Porto targets, even as they’re not reportedly interested in the same player.
It may come down to which club stumps up the cash first. Both Mangala and Martinez are expensive propositions, the Frenchman rated in the £35m range with the Colombian thought to have a £34m release clause in his contract.
Both the Gunners and Red Devils are expected to invest significantly in their squads this summer, but may be in a race to get the green light from Porto.
And if O Jogo’s assertion holds true, the club that shows up waving a hefty cheque second will be left to look elsewhere for reinforcements.