Chelsea interim manager Guus Hiddink says the Blues will not underestimate Watford when they take on the Hornets tonight.
The Blues have rediscovered their best form under the Dutchman as they continue their quest to finish in the Top Four.
And they will be determined to take all three points from Vicarage Road.
"Watford have a lot of quality," Hiddink is quoted as saying by BBC Sport.
"They have a very dangerous team. Flores was my player and I know how he can build a side, make them solid and difficult to beat,
"The gap between the top and lower clubs has not vanished but it has reduced.
"Yesterday he [Willian] did not train because he has a foot problem. Today he will be on the pitch and we will see how his reaction is after training.
"I don't know if he [Pato] is still up to playing the game, we'll decide later. He is in, let's say, the preparation stage but not fully fit.
"The paperwork for the deal is done and formally he is available, but it is another thing physically and mentally. He has hardly done a full training session with the whole team."
Asked about John Terry's decision to leave the club in the summer, the 69-year-old added: "The door is not shut, dialogue is always possible.
"He is very fit and he is not what you normally see from a 35-year-old player. Some feel they are getting a bit slower and cannot accept it.
"But there is none of that from John. He is fit. Regardless of the situation he and the club are in, he will be always very professional."
