Chelsea are weighing up an approach for a new centre-back this summer, with Rudiger and Christensen's contract talks currently on hold.
The Blues have long been targeting a new left-back but they are increasingly considering signing a new central defender.
Frank Lampard admires West Ham's Declan Rice - who is a close friend of Mason Mount and previously played as a centre-back during his time at Chelsea's academy - but the Hammers aren't open to selling their key asset unless relegation to the Championship forces them to reassess the situation.
If Chelsea does enter the market for a new central defender then they will likely face competition from Manchester City, Manchester United and Arsenal, who are all looking to improve their backline.
Meanwhile, Bayer Leverkusen's Kai Havertz is willing to join Chelsea and they face little competition for his signature as he looks to leave his club this summer, however, his £90m price tag remains an obstacle that will require some negotiation.
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