[6] He scored a header on his debut in Villa's first pre-season game of the season, against German team SV Rödinghausen.

[7] He made his Premier League debut on 24 August 2013 at Villa Park against Liverpool which ended in a 1–0 defeat.

Helenius scored his first goal for the club on 4 January 2014 against Sheffield United in an FA Cup third round tie at Villa Park.

[8] Helenius gained notoriety when he got his shorts pulled down by Jan Vertonghen in a game against Tottenham Hotspur, revealing his underpants.

After only three league games for Aston Villa in the first half season, Helenius was expected to leave the club.

With a lack of interest from suitable buyers he found himself seeing the season out in the sidelines, only making one appearance in the 2014 campaign in an FA Cup game against Sheffield United F.C where he also scored his only goal for Aston Villa.

[11] On 9 July 2014, Helenius returned to his previous club AaB on a season long loan deal.

He had a good season with 14 goals in 43 games and he was set to make the transfer permanent, as Aston Villa did not want to keep him.

[citation needed] On 15 August 2012 he made his debut for the Denmark national football team against Slovakia.