Hughes says an immediate debut is no foregone conclusion with the beefy defender playing so little football since the end of last season.
“He's a high-level player, a good personality and really focused," Hughes said of the 24 year-old Dutch international.
“He wants to get back playing again. He went out of the Porto side once they knew he wasn't going to sign. It wasn't down to a lack of form or ability, it was the circumstances of his contract - they weren't prepared to let him run it down.
“As a consequence, we've been able to bring a good player in, but he hasn't played a lot of football and so we might have to wait a while for him to get up to speed.
“We'll make a call on that for weekend, but he's very much in my thoughts."