Despite Campbell's positive impact on the team, Wenger said he was unsure whether he would sign him again due to the reaction of the transfer between the rival fanbases.
"I knew that it would cause heated debates in London, but I was truly convinced by the player," Wenger explained in an interview with 11 Freunde.
"I thought he was capable of facing the adversity. For me, it was easy because everybody was conscious that I had signed a great player. But for him, it was more complicated."
The defender received so much backlash from the transfer that Wenger did possess some doubts over the signing.
"The situation was really stressful for Sol and he told me afterwards how severe it became.
"He couldn't go to certain places for dinner or walk freely in London because of the anger of the Tottenham fans.
"In hindsight, I'm not sure if I would sign him again bearing in mind the difficulties he faced."