By Gabriel Tan
With one game to go, the Stags are currently top of the table but only a point ahead of DPMM FC, who have a similar goal difference but have scored more this season.
Tampines missed out on their chance to guarantee silverware for this season last Sunday when they fell to a last-gasp 2-1 defeat to SAFFC in the RHB Singapore Cup final, but Tay insists his men have put that disappointment behind them and are fully focused on beating Ong Kim Swee's young charges.
"At the end of the day, the players are all professionals," he told ESPNSTAR.com exclusively. "I am fully confident they will pick themselves up for Friday's game.
"This last game is the big one.
"I think it will be an open game as we have to go for the win. That's no doubt we'll be going out to attack from the start."
Back in 2010, the now-defunct Etoile created waves in Singaporean football when they became the first foreign side to win the S.League, and with DPMM in with a very good chance of repeating the feat, Tay believes it is imperative his side rise to the occasion and pip them to the title.
"It is of utmost importance that the title stays in Singapore," he declared. "It's not just about my team becoming champions.
"It is important for the whole of the S.League that we do not allow a foreign side to win the title."
Interestingly enough, the ex-Singapore international is good friends off the field with his Harimau Muda counterpart Ong Kim Swee.
Nonetheless, he admits he is not expecting any favours from his old mate on Friday, given the Young Tigers are also looking to pip Albirex Niigata to third place.
"Kim Swee and I may be friends but Harimau Muda will also have their pride to play for, especially as a Malaysian side playing in a Singaporean competition," Tay added.
Tampines will need to go for all three points on Friday to guarantee the title, as finishing level on points with their title challenges would crown DPMM as champions given their better goal record.