Arsenal crush set pieces, but how important are they in Europe?

Tottenham boss Ange Postecoglou has never appointed a set-piece specialist in his career.

Nicolas Jover is probably the most celebrated specialist in England .

Arsenal have scored 24 goals from set pieces since the start of last season in the Premier League .

Chelsea paid 750,000 in compensation to Brentford to sign Bernardo Cueva as a specialist.

Manchester United lost Eric Ramsay to MLS side Minnesota United FC .

Atléti don't detail the exact roles of their set-piece coaches, but a source has told ESPN that there is one coach whose work is around " 90% focused on set pieces" Barcelona also divvy up the work under new coach Hansi Flick .

Most coaches delegate the task to one of their assistants (or sometimes two : one for attacking, one for defensive) Most top Bundesliga clubs do not employ a specific set piece coach.

There are way more set-piece coaches on professional club payrolls than there were five years ago .

Gianni Vio , Nicolas Jover , Bernardo Cueva and Mads Buttrere are among the experts in the field.

The key to success is obviously variation and the element of surprise is vital.