Guardiola heads into the game on the back of a fine second season in England, winning the Carabao Cup and breaking records en route to the Premier League title.
And City have asked for a work permit for the 20-year-old.
"It was a problem for Brazil and the media from there".
In this morning's media watch we hear from the opposition ahead of Sunday's Community Shield match, a word from Tosin Adarabioyo on his loan move to West Brom and predictions for the new Premier League campaign.
"Also thanks to the Club for being so organised and focused since I arrived". "His courage, his fight to put every effort for the team is incredible".
Sarri has only been in his new position since July 14 and will still be fine-tuning his approach and looking at players who could make an impact. "He always wants to know what he can do better and that is fantastic".
But, as Sarri prepares for the Community Shield against Manchester City at Wembley on Sunday, Sarri said he does not feel his new club are short-handed.
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However, the youngster is yet to be granted a work permit to play in England and is ineligible to feature at the national stadium, with City now working to remedy the situation. But we will work for this target.
"Guardiola told me here in England that it is very hard, the level is very high", said Sarri, who declared his desire to remain at Chelsea for a decade.
And while Willian's future is seemingly secure, whether or not Thibaut Courtois and Eden Hazard remain Chelsea players this season is a different matter altogether.
"The way we play is we attack forward, we defend high, we try to get the ball from them and then play our football".
"We will see", he added.
"If at the end we decide to bring another one, it is because he's a special player, can be a special player for the future, not to have one more player for the number". "I'm so satisfied with the squad".
The manager has confirmed his record £60 million ($78 million) signing is in contention to start the match after he was forced off during last weekend's final match of the United States pre-season tour against Bayern Munich.