The Frenchman has scored seven goals in 19 appearances since joining from St Etienne.
And the 24-year-old says he has had no problems adjusting to the style of football in the Championship.
"I have found it easy to adapt," Sako told the club's official website. "In a way it has been natural but the manager and my team-mates have certainly helped me a lot. I am playing with confidence and enjoying my football.
"I don't mind the physical side of the game and how quick it is - that is me.
"I am really enjoying it here and just playing game to game and doing as well as I can.
"We have got a very dangerous attack at the moment. When we link together and attack the opposition we can be a threat as a team and we have to keep that going."