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According to Duncan Castles, Chelsea boss Frank Lampard is seeking to replace Andreas Christensen with Bournemouth defender Nathan Ake.
Ake left Chelsea for Bournemouth two years ago but has been linked with a move back to Stamford Bridge.
Castles does not think Ake is a top-level centre-back but he believes the Holland international is an upgrade on Christensen.
“I think Ake is a very solid Premier League defender,” Castles said on the Transfer Window Podcast.
“I’m not sure he’s going to be a top, Champions League defender.
“I think he’s skilful on the ball and he does the basic stuff pretty well but I think physically somewhat lacking and just not quite top tier.
“As an improvement on what they have, I can very much understand why they would be thinking of doing that, and at a price of less than £40m.
“Given the current inflated valuations of centre-backs in the Premier League, still a very young player, will count as homegrown, they’re a lot of positives to it.
“Andreas Christensen, I don’t see as being the answer. He’s been in and around that Chelsea team for a long time now.
“He looks like he should be a top modern centre-back. He’s tall and comfortable on the ball but he is not at all decisive or aggressive in his play and very error prone.
“I’ve not sure I’ve watched a game with Christensen against a top team which he hasn’t made some kind of error.
“So I can understand why Lampard is thinking ‘If I have the opportunity of getting this player in and the management of the club are on board with spending money on that player, I’ll take him and fit him into the system’.
“It’s definitely a weak point in the team at the moment.”