Rangel insists this is no time for resting on any laurels.
He said: "This has been a fantastic day, a fantastic feeling. These are days everyone with the club has to enjoy and a lot of people here deserve a lot of credit.
"Over the last few years we have been always climbing, but we must not get carried away, we must keep working and hopefully we can keep doing well and do something special in Europe.
"It will be difficult but if we keep our best players and the manager, I think we can do well.
"It's a chance to show we can play good football against all kinds of teams, with different tactics and we are looking forward to it."