Career
He plays primarily as a winger but is also comfortable playing as a centre forward. He made his debut for the Southampton Under-21s in the Under-21 Premier League in the 2012-2013 season, coming on as an 83rd-minute substitute for Jake Sinclair in the second game of the season against the Newcastle United Under-21s on 14 September 2012. On 10 November 2012, Seidi was signed by local League Two club Aldershot Town from Southampton on a month-long loan deal.
He made his debut for the club on the same day, in a 2–0 league loss against Bradford City, coming on as a substitute for midfielder Scott Donnelly in the 60th minute.
On 4 June 2013, he was released by Southampton. Seidi has been capped twice for the Portugal under-20 team, both in friendlies against the Slovakia under-21s, on 10 and 12 November 2012.
In October 2012 he was called up for the first time by the Portugal under-21s, for a warm-up match against the Ukraine under-21 team