The R's are bottom of the Barclays Premier League and on January 27, the day after they were eliminated from the FA Cup following a 4-2 home defeat to MK Dons, Fernandes wrote on his Twitter account: "I take all responsibility and will face the music... If can't fix it I will be first to go."
Asked about that on BBC Radio Five Live's Sportsweek on Sunday morning programme, Fernandes said: "If it goes wrong and people think that I'm the wrong chairman, then I'll step down, but my investment will stay and I will continue to be a board member and support the club, because I have a lot of ambitions for the club."
He added: "I just wanted to put on record that no-one else would take responsibility but the leader, and the leader of the club is me."
Pressed as to whether he was planning to step down, Fernandes said: "At the moment, no."
QPR are six points adrift of safety in the Premier League with 13 games left to play this season.
In an effort to bolster their survival bid, Fernandes provided the funds for current boss Harry Redknapp to make high-profile signings in the January transfer window, such as striker Loic Remy and defender Christopher Samba.
And Fernandes has rubbished reports that have suggested the latter, a deadline day arrival from Anzhi Makhachkala, is on a salary of £100,000 a week.
Asked how much Samba was earning, the Malaysian entrepreneur said: "It is not right for me to say, but it is nothing like £100,000 - it is more around the £65,000 mark. You would be close (with that)."