Former Arsenal manager Arsene Wenger revealed his regret over signing Sol Campbell from rivals Tottenham.
The England defender made the switch between the two North London clubs back in 2001 and became an incredibly successful figure in the heart of the Gunners defence as part of their 'Invincibles' squad.
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.'
Campbell's arrival at Highbury Stadium, Arsenal's old ground, came as a huge shock to the footballing world as there was no indication or rumours beforehand linking the centre-back to a controversial switch.
A smattering of reporters, expecting to see goalkeeper Richard Wright announced from Everton, were shocked when Campbell emerged in the press conference as a free transfer from the Gunners fiercest rivals.
However, 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.'
Campbell went on to win two Premier League titles, two FA Cups and helped Arsenal become runners up in the Champions League in just under 200 matches for the club.
Miockmnt
532
campbell will never won what he has won if he stay at spurs
Jikbcdeino
303
But Campbell was a beast in the team, a hard rock, a gem, very tough defender, a dependable scorer. We were lucky to have him when we did. Not we also had Walcott from their academy and they even offered us Gareth Bale. What is this thing about rivalry and alleged betrayal. It's quite unnecessary.