Both the management team, to some extent, and definitely the coaching staff, are paid very well to identify and exploit what motivates each individual player. Not everyone reacts to the same treatment in the same way. In the past there have been coaches that feel that one trick works for everybody, and if they don't get a robotic reaction, they shut down and blame the player. I don't really see Hartley and his staff taking this kind of hardline route. They are no doubt aware that Sven needs to be treated in a different way than Jooris to see results, and I don't think that they would potentially lose an asset through stubbornness or lack of desire to vary their coaching tactics.
Give it some time. Things will be tried to boost Sven's performance before there is any need to worry too much.
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