Career
Lazăr has been capped with Romania at senior level Sportul Studenţesc
Until 2006, Lazăr enjoyed a successful spell at Sportul Studenţesc. Rapid Bucureşti
Lazăr joined Rapid Bucureşti in the summer of 2006.
In March 2009, he was involved in an incident in which he was judged to have been fouled in the box by Oţelul"s Alexandru Bourceanu.
Lazăr, adamant that it was a fair tackle, refused to take the penalty and eventually persuaded the referee to award a drop ball, which his teammate Ovidiu Herea then kicked out for a goal kick. PAOK
On 21 July 2011, Lazăr signed a three-year contract with PAOK Football Club after he was chosen by the club coach László Bölöni.
He quickly became a key player for the club even after 5 matches. On March 25, in a game against Kerkyra, Lazăr scored two goals, to help his team to a 4-0 victory.
On January 6, 2013 Costin Lazar scored a wonderful goal for PAOK, winning 4-1 away to Panthrakikos, in a match of the Greece Super League.
This goal voted as the best of the week. Panetolikos
On 19 January 2015, Lazăr signed a six-month contract with Panetolikos F.C.
Iraklis
On 25 June 2015, Lazar signed an annual contract with Greek Superleague club Iraklis. International goals.