Greece's Alexis Tsipras has said his leftist Syriza party has a "clear mandate" after winning a second general election in less than nine months.
He also said recovery from financial crisis would only come through "hard work."
Tsipras later received the formal mandate to form a government on September 21, a day after Syriza won about 35.5 percent, still short of an overall majority.
Former Prime Minister Tsipras said he would form a coalition with the rightist Independent Greeks, which was his coalition partner before he stepped down in August in order to receive a new mandate.
Syriza was first elected in January on an antiausterity mandate, but was forced to accept tough conditions for Greece's third international bailout.
The EU congratulated Tsipras on his party's election victory and said Greece has "no time to lose" in implementing reforms.