By Gabriel Tan
Both sides played out a 1-1 at the Jalan Besar Stadium in the first leg last Friday, and many believes Marlon Alex James' second-half opener could prove decisive given the away goals rule.
However, Sathianathan believes the Singaporean outfit will pose a real challenge at the Majlis Perbandaran Selayang Stadium, especially with their prowess in the air, which led to them forcing a draw in the first leg when Safuwan Baharudin ventured forward and headed home a Shahdan Sulaiman cross with ten minutes remaining.
"It's a case of once bitten twice shy, as you can see from our previous game," he told ESPNSTAR.com exclusively. "Our whole team has to be focused on their play and avoid conceding set-pieces.
"If you look at the history of the LIONSXII, everyone can score goals. The team's quality in their delivery allows all their players to score, including Baihakki [Khaizan] and Safuwan, who are primarily defenders.
"We've got a battle on our hands against LIONSXII and they won't be an easy team to play against - they are well organised."
Nonetheless, with no injury or suspension concerns, the ex-Malaysia coach is backing his players to rise to the occasion in what he is expecting to be "a good game", and believes conceding a late equaliser in the first leg will only serve to spur them on.
"We have a full-strength squad and everybody is fit and ready," Sathianathan added. "A coach must be confident for the team to be confident, and I am focused and ready.
"We'll try our best and it's down to the players to deliver. The players feel bad they conceded the goal in the final minutes [of the first leg] and are raring to go now.
"It's still pretty much a 50-50 game as it's still open even with the away goals advantage, but I expect a good game."
ATM will be seeing plenty of the LIONSXII next season, after earning promotion to the Malaysia Super League by winning the Premier League earlier this year.