"When a player is not involved, you feel a little bit down," said Pochettino.
"Sometimes he had to stay at the training ground, alone, training. It was not easy for anyone. Maybe he was affected a little bit about that.
"Now, we're so happy with the way he's doing.
"His internal motivation is higher now, to try to compete at his best level. We're very happy with his performances, he's increasing his level.
"I'm not worried about him. It's true, he's disappointed too that he's not at his best.
"But it's coming, like the winter is coming."