Andrei Arshavin has urged boss Arsene Wenger to make further signings before the transfer window closes on September 1.
The Russia international feels that the Gunners lack depth in their squad if they are to challenge for the title over the course of the season.
Arsenal have added just Thomas Vermaelen to their squad this summer with Kolo Toure and Emmanuel Adebayor sold.
He pointed out that while a club like Everton was comfortable battling away with a small squad, a side wishing to challenge at the very top cannot expect to last the season without options.
Arshavin told the Sunday Times: "We still have to buy. That's my opinion.
"We shouldn't set Everton as a benchmark, we should be looking at the top teams of Chelsea, Manchester United, Real Madrid, Barcelona.
"We should buy first-class players, regardless of their age. We should buy the ones who should improve our game. The top teams have much bigger squads than ours and that is why we have to buy.''