At the Estadio Santiago Bernabeu, they would be delighted to welcome the attacker in the winter market that opens in three days, but the Blues don't want to lose him in the middle of the Premier League season. "So the problem is only this, I think".
And the former Barcelona star has been linked with a move away in January with offers coming from Serie A giants AC Milan.
Hudson-Odoi played a key role in England's 2017 Under-17 World Cup victory, appearing in all nine matches and setting up three goals in the 5-2 victory over Spain in the final.
"But I don't know the past so I can't say anything".
"And I think that in the market it's very hard to find a player with his characteristics".
A sticking point in talks over a new deal for Fabregas is Chelsea's policy of only offering one-year extensions to players over the age of 30, and Sarri hinted that the club's stance is too broad and inflexible.
"As you know very well the big problem is the duration of the new contracts". It depends on the single situation, I think. "The policy of the club is only to renew for one year for players over 30 years old".
"It's a rule and so we have to respect that".
Ivory Coast global Zaha has been Palace's standout performer under Hodgson over the past 12 months, which has led to speculation increasing over a move away from Selhurst Park.
"If he's good enough to play in a big team in the Premier League at 18 then he could be the best player in Europe in two years".
Chelsea now sit fourth in the Premier League, two points clear of fifth-placed Arsenal.