Willian has handed Chelsea a major boost by confirming he is not seeking a move away from Stamford Bridge this summer.
The Brazil international is a target for Manchester United, who are managed by former Chelsea boss Jose Mourinho.
The Portuguese was in charge of the Blues when Willian joined from Anzhi Makhachkala for £30m in 2013.
Willian has been a key player in previous campaigns but has started only 15 League games this term and United are hoping to take advantage.
But when asked by Standard Sport if he will definitely still be a Chelsea player next season, Willian said: “Yes. I have a contract with Chelsea until 2020 and I am very happy here.
“I have a great relationship with all the people that work at Chelsea and the fans too. They have been great to me since I joined.
“Chelsea are back in the Champions League next season and I am looking forward to playing in it again. It is a big, big target for us and we have to look to win that trophy next year.”
He added: “We want to end the season with the Double. We have the Premier League but we want the FA Cup too.
“This is a big game for us. It will be difficult against Arsenal and we have to be ready.
“We have to be focussed and play in the same way we have all season.”