Chelsea interim manager Guus Hiddink says his players have finally rediscovered last season's form after his side's 5-1 win at Milton Keynes Dons.
The Blues safely reached the next round of the FA Cup where they will face Manchester City.
And the Dutchman was visibly delighted and full of praise for his players at the end of the 90 minutes.
"We are delighted," Hiddink told BBC Sport.
"The concentration against the big teams is always high but these games you have to be well prepared mentally. They got even but we reacted very well.
"Oscar is playing with a smile on his face and that's what I like with the players when they know their obligations and they do it.
"[What changed since my arrival?] What I asked in the beginning is when they made the contribution to be champions last year? I wanted the contribution they did then. I asked the players 'what did you do? Let's try to go back to what your basic skills are."