Fans have called for Parisian police to intervene

His display at Old Trafford in midweek to help PSG beat Manchester United grabbed the headline across the globe and left some stunned by the pace he possesses.

But the 20-year-old has also been subjected to sick abuse of the rail system in the French capital, believed to have been carried out by right-wing groups.

The hugely offensive messages have appeared on the RER C - one of the metro lines running across Paris both overground and underground.

One used the N-word, and is accompanied with a Celtic cross image - a symbol said to be used right far-right extremists in France.