Wenger admitted it had not been as easy to do business as he had hoped, but remains determined to bolster his squad, which faces a crucial Champions League play-off later this month.
"We try and get what we want; if that doesn't work we will look somewhere else," Wenger said in an interview with Al Jazeera Sport.
"The clubs with talented players don't want to lose them.
"Some clubs acted very early so the choices were reduced and there is more competition coming from France with Paris St Germain, who buy big players for huge amounts of money, so it's tough, difficult and slow.
"I can assure the fans we will try very hard to keep them happy. We are certainly ready to spend the money, but the process is going slowly, but surely."
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