On 26 December 1979, at the age of 17 years and 242 days, he became the then youngest scorer of AEK in the league when he scored 2 goals in a match against Kavala.
Vlachos had a big part in winning the cup in 1983, scoring a very beautiful goal with an individual effort in the final against PAOK.
It was the beginning of a court series that lasted several months, which resulted in Vlachos playing for Panathinaikos, but after his contract with AEK expired in December 1985.
In 2003 he took over Ionikos, from which he left in 2005, to continue in OFI,[7] while in 2006 he had a short spell at Panionios[8] and after the end of his term there, he retired for three years due to family obligations.
[9] After one and a half season, he took over the financially ruined AEK Athens in 2012, with Mavros as president in an effort to keep the club in the category.