Chelsea are in desperate need of new signings with just 14 experienced players currently on their books.
Antonio Conte has admitted the club are working tirelessly behind the scenes to bring in more players before the transfer window shuts on August 31.
And Blues legend Frank Lampard thinks Southampton defender Virgil van Dijk should be their No 1 target, even if they have to pay over the odds.
"If you are looking around for a centre-back, Van Dijk is probably the best there is out there at the moment with Premier League experience and Chelsea should try and get him," Lampard told Yahoo Sport.
"I was watching some video clips of him a few weeks back and when you study him, he is a class act.
"He is powerful in the air, comfortable on the ball, he can command a defence, he has it all.
"John Terry had that presence in the Chelsea defence for a long time and it is hard to find players like that, but Van Dijk has something about him.
"It is often the out-and-out striker who scores the goals and the dominant centre-half that are the two big positions in a team and they are hard to get."
And Lampard thinks Chelsea should go all out to sign the Holland international, even if it means paying crazy money.
"It means you have to pay over the odds for them because they are not easy to find," he added.
"The money being spoken about for him may be high, but we have to accept that the game has gone this way and the figures being talked about now are crazy.
"What seemed crazy figures last summer, don’t look crazy now and I just don’t know how much longer the Premier League can go on like this, but you have to pay these prices to get players right now."
Source: Daily Express