Robertson told reporters: "Trent's head is not great because he's injured. He hates being injured - none of us like being injured but it hurts Trent a little bit more. That's all he is focused on."
Asked about the potential of a move to Real, Robertson added: "It is impossible for me to say we have not seen all the noise and everyone commenting on it," he added. "But for us our focus is for him to get back fit and healthy.
"Once he does that, what will happen, will happen. No one knows that yet. People can talk and speculate but for us we want Trent back very soon."