Born in Kosice, Slovakia, on on 9 December 1992, Lalkovic joined Chelsea at Under-14s when his family moved to England from Slovakia. A wide player who is very quick and predominantly right-sided, Milan can play anywhere across the front three and featured for the youth team and reserves in 2009/10. He played his part in bringing the FA Youth Cup to Stamford Bridge and featured in the first-team pre-season games in July 2010.
He was a key member of Steve Holland's reserve side during the 2010/11 season, frequently playing down the middle of an attacking three where his pace could help him get in behind opposition defences. He contributed six goals in 17 appearances as we wrapped up the national reserve league title.
Having completed a reserve team pre-season, he joined Doncaster Rovers on a one-month loan deal on 18 August. An impressive few weeks saw that particular deal extended for another month until October. In total he made six appearances before returning to Chelsea.
At the end of January 2012, Milan made a second loan move, to Dutch side ADO Den Haag, where he made two substitute appearances.
He played the first half of the 2012/13 campaign on loan at Vitoria Guimaraes in the Portuguese top flight, for whom he made his debut as a substitute in a goalless draw against Sporting CP, before returning to Stamford Bridge in January 2013.
In July 2013, it was announced that Lalkovic would join Walsall on loan until 4 January.
Previously an Under-19s international, he made his debut for Slovakia Under 21s in February 2011.