The 48-year-old does not believe Tito Vilanova's team are assured of the league title and says the club will continue to work hard for the rest of the season
Tito Vilanova's team are unbeaten in the league during the 2012/13 season and a number of pundits and supporters already believe they cannot be caught at the top of the table.
The Catalans' 4-1 win over Atletico Madrid on Sunday, coupled with Real Madrid's 2-2 draw with Espanyol, saw them move further clear in the title race, but Rosell explained that the campaign is far from over.
"People think the season is over. They believe mathematics must say that this is over. But it is all open and we all have to work," he told reporters at Festa de l'Esport Català.
"We cannot relax, everyone wants to reach our aim, so we must work with humility, passion, effort, dedication and attitude until May or June. We will not stop."
The Camp Nou outfit play their final match of 2012 at Valladolid on Saturday, as they look to end the year with yet another victory.