George McCluskey, though, hopes it will not prove to be the pinnacle. When the former Celtic striker wonders whether Watt may have been "unfortunate" to have created such an iconic moment so early in his career you can almost understand his logic. Once you have scored a winning goal, aged just 18, against a team regarded by many to be the best of all-time then you have to go some way to better it.
McCluskey, though, hopes Watt's cv will eventually show a number of significant entries rather than just one. The £100,000 signing from Airdrie has scored just once since "that goal" - against St Johnstone the following weekend - and is being spoken about as someone who could be sent on loan to garner experience elsewhere. A combination of events at Celtic, however, have presented a timely window to show his abilities.
With Gary Hooper away to Norwich City and Anthony Stokes injured, Celtic are light on forward options for tomorrow's Champions League play-off against Shakhter Karagandy. Needing to score at least twice to have any chance of reaching to the group phase, Celtic must create chances and rely on their forwards being clinical. Watt started in the 2-2 draw with Inverness Caledonian Thistle on Saturday and could be given the nod by Lennon again. If so, McCluskey has no doubts that the 19 year-old will be ready to shoulder that responsibility.
"This could be a big night for Tony," said McCluskey, no stranger to big Celtic moments himself having scored European Cup goals against Ajax and Real Madrid. "If ever there was a night for another Barcelona moment, it's this one. If Shakhter come out of defence a wee bit then he's got that sharpness and pace to get away from them. I'd have no fear about putting Tony into a game like this. I'd have every confidence in him to do a job.
"He's got a lot of skill and he's also got pace to burn. It's a chance for him to go out and prove himself, show what he did against Barcelona. I thought he could have scored again that night if he hadn't been brought down by [Javier] Mascherano. Tony showed blistering pace to get away and Mascherano's no slouch.
"Everything he does in his career is going to be compared to that night but here's a chance to show he's not a one-goal wonder. He's still a young boy so he's maybe fortunate, or unfortunate, to have scored that goal so early in his career. Hopefully he can go out and score a couple against this team on Wednesday night."
It is a match that will define Celtic's season for many reasons. Defeat will mean dropping into the Europa League group phase, which will seem like a poor consolation prize given the excitement generated last year in the Champions League. Financially it is also significant for the club. Celtic made around £22m from Europe last year, some of which will trickle down through the club as McCluskey, a coach of the under-15s, can testify.
"It's vital that money is invested in the academy," he said. "People don't appreciate how much it takes to run youth development. From under-13s up to under-16s we've got all of the boys going to one school at St Ninians in Kirkintilloch. They get picked up at 6am, fed, educated, coached, and the logistics of all of that is quite something. But is also costs a lot of money. People don't often appreciate that."
Having no Champions League football will also influence the calibre of player Lennon can attract to Celtic in what remains of the transfer window. Linked yesterday with Israeli midfielder Nir Biton and Congolese winger Jires Kembo Ekoko, and with talks ongoing regarding Schalke's Teemu Pukki, McCluskey admits a diet of domestic and Europa League football might not prove all that appetising to some signing targets.
"Obviously it's vital for Celtic to win the league. But to reach the group stages is unbelievably important for the club. I think the way Scottish football's going, it's a bit of a foregone conclusion that Celtic are going to win the league. And to tempt players to come here, I don't really think it's easy.
"Celtic are looking for players of quality and ambition. Now, if you're trying to entice a player with those qualities to Scottish football just now, well it's not a great climate at the moment is it? Someone with ambition will look at Scottish football alone and think 'I'm not interested.' But if you're adding the Champions League to the mix then that can make a difference. It can make them think 'Aye, I'll go there now.'"
n McCluskey was announcing the closing date for nominations for the Scottish Hall of Fame. Fans can vote at www.sfmhalloffame.com until midnight on Sunday September 1.