The Holland midfielder has had a slow start to his career in England.
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But asked if he still has the same enthusiasm about the former RB Leipzig midfielder, Frank responded: “Yes. No doubt about that. I’m not in doubt that Xavi will perform very well for us.
“That is down to him, to me, to the team, to everyone to get it done. The one thing you don’t have in football is time, but it will take time.
“It’s completely natural. Sometimes we can’t talk about processes and time and all that, but the reality is you need it, everyone needs it."
“I’m confident. I’m sure it will happen."