Brazil's friendly against Argentina in China on Saturday is under threat because Beijing is engulfed in smog

Players are stuck in their hotels after authorities issued an orange pollution alert - the second highest level.

They players stay inside the hotel and only go out for training. Out of every 24 hours, they spend 22 inside the hotel. Which in the build up tom what will be an intense game of football is nothing short of unacceptable.

The Argentina squad for the "Super Clasico" match at Beijing's Birds Nest stadium includes Barcelona's Lionel Messi, Manchester United's record signing Angel Di Maria and defender Marcos Rojo, and Manchester City's Martin Demichelis, Pablo Zabaleta and Sergio Aguero.
Chelsea players Willian, Oscar and Filipe Luis, Liverpool's Philippe Coutinho, Barcelona wounderkid Naymar and a KAKA making his first apperance for Brazil since 2013 are in the Brazil squad.Beijing has an ongoing problem with smog but farmers burning plant stalks after the autumn harvest has made it worse and the noxious cloud is expected to remain until Saturday.

Arsenal Vs. Chelsea what to look for

Wenger v Mourinho

these two men don't like each other and even though Wenger has previously said its not about the people on the touchline that was before "the special one" said wenger was used to losing.

The bench could be as eventful as the match.

Fabregas against in his old club Wenger admitted ahead of the match that Fabregas wanted to return to Arsenal before joining Chelsea, but the Gunners decided not to buy him because they already had plenty of options in midfield. Being a professional, Fabregas has moved on. But, at the same time, he has a special bonding with Arsenal and their fans. It will be an emotional game for him.

The match

Both teams are unbeaten this season and while Chelsea have been brushing teams aside and Arsenal tripping and stumbling their way through matches this is a derby and anything can happen between two very good teams.