Manager Russell Slade has said Cardiff are looking at whether Juan Cala broke club discipline rules on social media.
Aston Villa boss Paul Lambert has defended his decision to send striker Darren Bent out on loan to Brighton.
Manchester City youngster Karim Rekik has joined PSV on loan.
The teenage defender, who made his Premier League debut in December, will spend the whole of next season in Eindhoven in his native Holland.
Rekik - an Under-19 international - spent three months at Blackburn in the spring and has previously been on loan at Portsmouth.
He had been due to travel to South Africa as part of the squad for City's two-match pre-season tour.