Despite Quina long being considered one of the brightest prospects at the London Stadium, he has been linked with a potential move away from the Hammers for much of the window.
And it appears that the 18-year-old - who helped Portugal's under-19s win this summer's European Championships - is apparently in contention to seal a move even after the transfer deadline has come and gone for Premier League sides.
According to Sky Sports (09/08; 17:48), the teenager has travelled to Watford's training ground and is now in talks with Javi Gracia's men in the hope of sealing a move at the final possible moment. Another report from Sky Sports suggests that the deal involves a loan move.
It would be a major surprise if West Ham had been willing to let Quina go permanently. While he is yet to make a significant impact in the first-team, he is clearly an extremely bright talent who could go on and enjoy a superb career if he realises his potential in the coming years.
But if Watford are prepared to offer the youngster a decent amount of game-time, a loan deal could perhaps be a fantastic move from the Hammers, who have done some superb business in the middle of the park this summer. It remains to be seen though, if there have been any discussions regarding a longer-term deal.