The former Blues has admitted that he had got more game time, possibly to prove he had what it took to maintain a first team spot.
However, this what not to be as Hiddink made it clear from the start that he was a back-up player.
“I wish I had played more, but I understand,” the Brazilian said of his time at Stamford Bridge.
“Twenty days after I arrived, everyone who was injured returned. And I was the last one, had just arrived. It was not what I expected, but it passed.”
Pato, who joined Villarreal on a permanent deal in the summer, admits Hiddink made it clear from the start that he was a back-up player.
The 27-year-old added: “Guus was very correct from the first day. When I arrived, we talked a lot. Chelsea had two or three players injured.
“Guus told me: ‘Look, Pato, you know there’s a hierarchy here, we have rules. You’ll be here, and I’ll give you a chance when I can.’
“I went to Chelsea with an illusion that I would play and show more, so maybe I could stay longer.
“Unfortunately I wasn’t able to play what I could have played. In the two games I played, I showed my football, I scored on my debut.”