Miazga, 20, is set to put pen to paper on a four-year deal at Stamford Bridge on Friday, after leaving the US training camp where he was preparing for friendlies against Iceland and Canada.

Chelsea have in fact been watching the New York Red Bulls defender for some time but it was still a surprise when this week they moved for the son of Polish immigrants who is rated one of the best prospects in the Major Soccer League.

With England centre-back Gary Cahill having indicated that he was unhappy at not getting any games under boss Guus Hiddink, Chelsea now have four central defenders, with skipper John Terry and Kurt Zouma currently the first choices.