Arsenal boss Arsene Wenger says the £36m Manchester United paid to sign striker Anthony Martial shows how difficult it is to sign quality players in the transfer market.
Arsenal fans were left fuming after the transfer window ended with only Petr Cech added to the squad.
But the 65-year-old, who believes that the youngster's deal could be worth as much as £59m, insists that it is not easy to find the right players on the market.
"What happened last night with Monaco, who sold Martial to Manchester United for 80million Euros, I've heard; Martial scored 11 goals in the French championship - that sums it up well," Wenger told beIN Sports.
"That means it's not the money that's missing at the moment, it's not the desire of investment that is missing, it's the number of players available who can strengthen the big clubs.
"The problem at the moment is finding the players that guarantees you are a better team after, and that example last night shows you very well.
"Martial is a huge talent - he's 19 years old. The investment is absolutely huge as well. It shows you that there's not many players in the world who can strengthen these teams."