The Black Cats chairman has defended the £20 million departure of their academy graduate to Anfield and remains ambitious for the upcoming 2011-2012 campaign
Henderson will become the club's second star player to leave the Stadium of Light this year, after Darren Bent's £24 million exit to Aston Villa.
However, the chairman has remained positive towards the future of the club and promises that other players are being looked at and 'progress' will continue.
Quinn wished Henderson the best, stating to the club's official website: "Jordan is a credit to himself, his family and Sunderland's Academy and everyone here wishes him the very best for the future."
Although admitting the England Under-21 star is a great loss, Quinn remained pleased in finishing the deal and moving forward with the club's future.
"I'm pleased that we got the deal to a level that we felt was right for our club.
"We know the areas that we need strengthening and the type of player we need in order to progress, and the job of bringing those players to the club is continuing at pace."
With the sale of Henderson, and the past sale of Bent, it is looking more and more likely that the club will bring in a few major signings. In recent weeks, it has been rumoured that Black Cats manager Steve Bruce is keen to add a host of players to his squad, most notably Peter Crouch, Roman Pavyluchenko, and Charles N'Zogbia.