Saints head to Celtic Park in the Scottish Cup tomorrow the scene of our famous win in the final of the competition back in May 2014 against Dundee United.
This time it's a 5th round tie against the current holders and Scottish champions Celtic, who Saints will face for the third time in just 11 days tomorrow afternoon.
Looking ahead to the game the manager is under no illusions of the task his side face to progress to the next round but believes his players are capable of winning the match.
"It's the toughest draw you could get," Tommy said, "having to go away to the holders and champions.
"They're in great form and they've beaten us twice very recently so we know just how difficult a game it's going to be.
"We're underdogs but in the past we've thrown up unexpected results and I believe we can do that tomorrow.
"We're not going there to lie down - we're going there to do our best to win the game."
Saints fell to a 2-1 defeat in our last outing on Wednesday night against Hamilton Accies and the manager believes his players are determined to bounce back on Sunday.
"They should be itching to get out there," he said, "it's obviously disappointing to lose any game but Wednesday night was particularly poor because it was a game we shouldn't have lost.
"Poor decision making in the final third and mistakes at the back meant we contributed to our own defeat.
"I know the players are disappointed and we've got to pick ourselves up and go again tomorrow. Hopefully we can turn that disappointment into joy on Sunday."
The match sees Saints return to Celtic Park for a Scottish Cup tie where, in 2014, Tommy Wright masterminded a victory over Dundee United to lift the trophy for the first time in the club's history.
Although tomorrow is bound to bring back memories for the manager and players involved that day, Tommy knows that it's a different game on Sunday afternoon.
"Winning the Scottish Cup will live with me forever and it's the same for the fans and players involved as well," the manager said.
"However, tomorrow is a completely different game. It's a different team we're up against and it's an away tie not a cup final.
"It might feel a bit like a final though as there will be a big crowd there and we're more than capable of coming away from the match with a result.
"We've got to go out there and perform and if we do that then we can make it another special day at Celtic Park."
Kick-off tomorrow is at 1:30PM and the match will be broadcast live on Premier Sports in the UK and on Saints TV for overseas subscribers.
UK subscribers to Saints TV will pick up live audio from the match with the full match replay and highlights available from Monday.
Chris Millar returns as co-commentator once again tomorrow afternoon on Saints TV!
Supporters looking to purchase tickets for tomorrow's match should note that the McDiarmid Park Ticket Office is closed today but will open between 9AM and 11AM tomorrow for last minute purchases.
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