Arsenal captain Cesc Fabregas accepts they're outsiders for this season's Premiership title.
But Fabregas knows the importance of the club challenging for the championship they last won in 2004.
Speaking to the arsenalfcblog.com website ahead of the West Ham match, the Spain international reflected: "Of course we are under pressure to win the title because Arsenal is a big club and expectations are always high.
"But the other challengers have spent huge amounts of money in recent years to build their squads and perhaps they are the ones who are under the most pressure because of this investment.
"Arsenal has a long-term vision for the future."
Fabregas added: "Nothing is ever impossible. We are not the favourites this season, but we truly believe we can we can fight for the championship.
"This team is maturing and growing in confidence all the time."