Barcelona and Chelsea are chasing Grasshoppers fullback Allan Arigoni.

The Sun reports Barça have sent Jose Mari Bakero to check out the defender, while Chelsea are also watching.

Arigoni's stand out quality is his speed. His pace has allowed the 21-year-old to break into the team (he's played 15 league games), setting up five goals.

A study revealed that he, along with Borussia Dortmund's Achraf Hakimi, is the quickest defender in the game at 35km/h.

Neither Barça nor Chelsea have made an official offer yet, but say he could be part of Frank Lampard's future transfer plans.