By Gabriel Tan
This comes after the Nigerian-born striker put in what his coach called "his best performance of the season" on Tuesday in the Singaporean outfit's 2-0 win over Pahang, which saw them progress from the quarter-finals 3-2 on aggregate.
However, it remains to be seen if the move to start Casmir, or 'Agu' as he is more famously known as, could backfire for the LIONSXII, should Sundramoorthy stay true to his words.
Admittedly, the 28-year-old is frequently subjected to unfair criticism given his laconic demeanour on and off the field, and the fact he racked up 100 goals in the Great Eastern-YEO's S.League in just six seasons shows he is more-than-capable of finding the back of the net.
Nonetheless, the Singapore international is no longer the same athletic youngster that bullied defenders into submission, and more importantly, he currently looks a man bereft of confidence, something which has not been helped by the fact he's spent much of the season warming the bench for the Malaysia Super League runners-up.
When the LIONSXII announced the squad for their inaugural season playing in Malaysian football, all signs were pointing to Agu spearheading the attack, while the likes of Shahril Ishak and Khairul Amri were expected to provide him plenty of support.
Instead, Shahril, whether by tactical instruction or sheer talent, has emerged as the focal point in attack for his side, while up-and-coming strikers Sufian Anuar and Khairul Nizam were both preferred to Agu at various stages of the campaign.
Whenever he has made his way onto the pitch, the Lagos native is either brought on to hold up the ball in attack with the LIONSXII looking to hold on to a lead, or as a last-ditch measure to grab a late goal. And with each such appearance, the lack of proper playing time - and subsequent goalscoring opportunities - deals a bigger blow to his already-fragile confidence.
The scenario was slightly different on Tuesday when, after Amri picked up an injury, he was thrown on to lead the attack in the 37th minute, with Shahril and Safirul Sulaiman deployed out wide.
Being the main man up front, as well as being handed more time to shine, Agu began to show signs of his former self, as he held up the ball well despite regularly finding himself in two-on-one situations against Zaiza Zainal Abidin and Saifulnizam Miswan.
On the hour mark, with the LIONSXII leading 1-0 thanks to Shahril's first-half header, he even produced the perfect bit of play expected from a target-man when he dispossessed Saifulnizam on the edge of the area, turned and slipped a neat pass to Hariss Harun, only to see his team-mate blaze over from 12 yards.
However, things will be very different against ATM on Friday, who are vulnerable at the back at times, but more than capable of scoring a big bag of goals.
Given how the match is likely to pan out, Sundramoorthy might be better served with a striker blessed with clinicality, something Agu is lacking in at the moment, as he showed against Pahang when he missed an absolute sitter from six yards out with the goalkeeper already beaten.
Furthermore, he has already faced off with ATM centre-back Aidil Zafuan once this season when Singapore took on Malaysia in a friendly at the Jalan Besar Stadium, with the defender clearly winning that duel back in June, leading to Agu's substitution in the 71st minute.
It might, therefore, be wiser for the LIONSXII to use Shahril, a proven big-match player, as the main striker against the Armed Forces, or even reinstate Sufian in the starting XI, who is raring to go after recovering from injury.
Alas, it appears the decision has already been made.
"For me, Agu played his best game of the season tonight [Tuesday]," Sundramoorthy said in Tuesday's post-match press conference. "He just wanted to go out there and prove me wrong, and he did.
"He will start the next game."
If he stays true to his word, the LIONSXII boss could just find himself in a very unhappy position come Friday night.