Vietnamese players produced a shocking display against Malaysia in the second leg and lost the semifinal tie 5-4 on aggregate. STR/AFP/Getty Images

Vietnam Football Federation(VFF) have asked the local authorities to investigate the country's football team for any suspicion of foul play after their 4-2 capitulation in the second leg of their AFF Suzuki Cup semifinal against Malaysia.

Toshiya Miura's men had a 2-1 advantage from the first leg and was firm favourites to make it through to the final but was clearly not at the races on Thursday night at the My Dinh Stadium.

Dollah Salleh's men put four goals past them while a Le Cong Vinh brace was all the home team could muster.

As reported by New Straits Times, VFF deputy chairman Nguyen Xuan Gu indicated that the players may have played poorly on purpose.

"The Vietnam Football Federation will immediately ask for police to investigate the match," said Xuan Gu. "We will seriously punish wrongdoing if we find any. The goals we let in were unacceptable, especially as we were playing at our home stadium,"

This is not the first time Vietnamese players have gone through a suspicion of foul play. In 2007, two Vietnamese footballers were jailed and six others were given suspended sentences after being found guilty of rigging an Under-23 match against Myanmar at the 2005 Southeast Asia Games in return for some cash.

Malaysia will now take on Thailand in the final that will be played over two legs on Dec. 17 and 20, to decide who lifts the 2014 ASEAN crown as the best football country in the region.