"We believe in our players and anyone who joins this group has to prove himself. It is for Jayden and anyone else, we won't give gifts to no one," Cardoso said when speaking to reporters.
"They will have to rise and show that they are better than all players and then we will see. So, Jayden and anyone joining the group must prove themselves to everyone.
"We are open to discussing and analysing performances daily and the players that perform better and the ones that will go on the pitch," he added.
"Anyway, we have a lot of competitions and we will give them a chance to adapt and take the best from them."