Speedy left-sided 18 year old Tomic resisted overtures from a number of A-League clubs to sign a one year deal to join the competition newcomer after a breakout season in the NSW Premier League.

Tomic will be joined by promising teenager Behich who has signed for seven weeks as an injury replacement player for Kristian Sarkies.

Behich impressed in his trial period with the club, featuring in games against Everton FC, Newcastle Jets and Brisbane Roar to earn a professional deal.

Coach John van ‘t Schip is confident Behich and Tomic will be able to provide added depth to the club's squad and press for a place in the line-up on matchday.

"Ante and Aziz have proved themselves to be excellent talents and trainers throughout their time at the club, and I feel they will certainly add an extra dimension to our squad," he said.

"With youth a key focus of the club's philosophy, we are pleased to have signed such promising youngsters. They are very raw talents that we are confident can develop into exceptional professionals while working with the likes of Simon Colosimo, Josip Skoko and John Aloisi.

"In relation to Aziz, we are very pleased to give him another opportunity at the elite level. One of the great benefits of more professional clubs in Australia is the greater opportunities it gives to young players to stay in the sport during their important development years."

Tomic's signing marks the culmination of a meteoric rise for the swashbuckling winger, who was entrenched in Sydney United's junior system only 12 months ago before being elevated to the U21 side by Heart's Ante Milicic.

Behich meanwhile arrives at Heart having played a role in the 2010 Grand Final, featuring as a second half substitute as Sydney FC claimed the title , while he was also named in Victory's squad for the 2010 Asian Champions League.

The arrival of Tomic and Behich brings the total number of players signed by Heart to 21, including 11 fresh arrivals to the Hyundai A-League.