It might be the 20th anniversary of Ole Gunnar Solskjaer's dramatic winner against Liverpool in the fourth round of the FA Cup, but Manchester United's interim boss still believes that Peter Schmeichel's penalty save against Arsenal in the semi-final was the key to Treble glory that season.
Solskjaer's strike in a 2-1 comeback win over Liverpool at Old Trafford in 1999 set the tone for United's unprecedented success as Sir Alex Ferguson's side went on to win the cup, Premier League and Champions League.
However the Norwegian still points to Schmeichel's save from Dennis Bergkamp and Ryan Giggs's sensational injury-time winner over Arsenal as the moment the pendulum swung in United's favour.
As he prepared to face the Gunners in this season's fourth round at the Emirates on Friday night, Solskjaer said: 'That's the one fierce rivalry on a football basis in my years between the two of us. Always the closest rivals, they won the Double, we won the Treble, and the games were just fantastic. We had a great team, they had a very good team.
'I think I just scored once against David Seaman, but the French connection they had – Henry, Vieira, Pires, Petit – I met them a couple of times in the FA Cup. I think I won two semi-finals, but we lost 2-0 at home once. There were some tackles flying in between the two teams. Fantastic games.
'The semi-final in '99 is such an important game, and when Peter saves that penalty from Dennis Bergkamp that gives us the advantage and we win the Treble. If Bergkamp had scored, they'd have won the Double, that's how small the margins are. That's the standout for me.
'I watched Giggsy's goal from the sidelines and that was the one highlight apart from walking out on the pitch at Wembley in '99 because growing up in Norway that's the game you look forward to and still remember. Norman Whiteside's curler after Kevin Moran was sent off (against Everton in '85), that was the one game we knew we were going to watch.'
Solskjaer has previously faced Arsenal boss Unai Emery when they were in charge of Molde and Sevilla and respectively.
He added: 'Obviously Arsene Wenger and the gaffer (Ferguson) are the two longest-serving managers in my era. They were fantastic, an institution in the club.
'It's going take time but Unai – they beat us (Molde) with Sevilla – and they've made a very good signing tactically. He's very good. I don't know what team he's going to play, he's got loads of different tactics.'