Wednesday will take on Braga during next month’s training camp in Portugal.
Braga, who played in the same group as Manchester United in last season’s Champions League, finished fourth in the Portugese Premeira Liga last season and will be involved in play-offs for next season’s Europa League qualification.
The match against the Owls will be played in Albufeira on July 16, with the actual venue still to be confirmed, and kick off provisionally arranged for 8pm.
Wednesday have already arranged a match against Hull at the Estadio Municipal de Albufeira on July 20 to complete their week-long Portugese training programme.