The Portugal youth international has featured eight times for the development squad so far this campaign, having made 16 appearances for the Academy last season. Cardoso will now look to acquire valuable first-team experience at Basel, who currently sit fourth in the Swiss Super League, nine points behind leaders Young Boys
The Portuguese Centre back signed a five-year contract with West Ham in August 2019 under Manuel Pellegrini as his fifth signing of that summer transfer window. The Hammers forked out a transfer fee of £2.8m with an additional £1.8m of add-ons based on Premier League starts plus a sell-on clause should be sold on for a profit. The left-footed defender can also play at left-back but has failed to break through to the first team at his short time at the club.