The former RB Leipzig midfielder was also interesting Chelsea, but ultimately agreed to join Spurs last week.
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Speaking from Holland's training camp, Simons explained: "The manager said a lot. Positive things, but also things I need to improve. It's great how he sees football, how he wants to make players better...
"And it's nice that he was honest, that he wants to improve things with me.
"Micky van de Ven said 'we need you so come here'. And that's what happened!"