Van Persie will have a medical today at Manchester United after deal worth £24 million was struck between the two clubs.
Wenger has the best part of two weeks to spend some of the money before the transfer window is closed. He said on French TV on Wednesday night: "It’s sad to lose a player of his quality. He had only one year left on his contract so we didn’t have the choice."
Asked who he would recruit, Wenger said: "We already signed Lukas Podolski and Olivier Giroud."