"He's a really good player," Hargreaves told BT Sport. "He's a great young player, but they have a lot of those great young players.
"I think they need some leaders in there. Havertz for £90 million, you want ready-made, walks in and makes you a better team and I think the worry is they spend right now £200 million on Werner, Ziyech and Havertz and they can still finish fourth or fifth.
"They want to win a title and I think Havertz is a special player but it feels like they need to sort out the keeper and the centre-backs first.
"Mason Mount could play in there, where does Mason then play? He's had a good season."