Fabianski feels he has shown more than enough quality to challenge fellow Pole Wojciech Szczesny for the number one jersey, having impressed when recalled to the side with consecutive clean sheets in the wins over Bayern Munich and Swansea.
The 28-year-old said to the club's official website: "It is just about focus, being vocal, being ready, being switched on and stuff like that. I know that with my abilities, I will be good.
"Maybe that's the way the boss sees it now, that I went through a total mental transformation.
"I know what I am capable of. I know my strengths, I know my weaknesses and I know how to deal with it so that's the main thing for me."