Analysis: 'A statement of intent'

Girma's talents are no secret and she is widely regarded as one of the best female footballers.

Former Chelsea boss Emma Hayes, now the USA manager, said last year Girma was the world's best centre-back and she will no doubt be pleased to see her old club scoop her up.

Having enjoyed a taste of silverware with the USA and San Diego, Girma arrives in England with ambitions to win more trophies, particularly in the Champions League, and is believed to have had discussions with Hayes about what to expect from Chelsea.

Lyon offered higher wages and were prepared to match the transfer fee that Chelsea eventually had accepted by San Diego, but Girma's preference was always to join the Blues.

It is manager Bompastor's most significant signing to date and the club believe Girma will take them one step closer to a first European title.

The long-term deal agreed is also a statement of intent from Chelsea – that they are able to attract the world's best talents and, hopefully, keep them.