The Sunderland chairman and club owner Ellis Short are due to hold an end-of-season review with manager Steve Bruce later today.
As well as discussing transfer targets and plans, Quinn is also determined to ensure they get to the bottom of the problems Sunderland encountered this season.
A significant list of serious injuries severely hampered and damaged a promising start to a campaign that had them pushing for a European place at the beginning of February.
And Quinn said: We know we've been derailed by injuries throughout the season and there is a thought in everyone's mind about what might have been' over the last nine months.
But I assure you, no quarter will be given or stone left unturned until we find out what has gone wrong over the last three months. Mark my words, the things that need to change will do so.
Despite a worrying run of ten defeats in 13 matches, Sunderland ended the season with six points from nine to climb up to tenth and finish there for the first time in a decade.
Quinn added: We're building something to ensure longevity of success. We don't intend to be a flash in the pan club where we do it for one year and struggle afterwards.
Take Portsmouth for instance, a fantastic team Harry Redknapp put together that went on to win the FA Cup in 2008.
I tell you they're paying for it now.
People want success at this club yesterday and while nothing would give me pleasure than to give the fans a second major cup since World War Two, we need to get there in time.