Petro has floated some moderates as possible finance ministers, including Alejandro Gaviria, a centrist economist and former health minister, as well as ex-ministers like Rudolf Hommes and Jose Antonio Ocampo.
"It will be very important that total confidence between everyone is restored, that there is confidence for businesses, citizens, that there is confidence for investors, that there is confidence with the rule of law," Bruce Mac Master, president of the Colombian Business Association (ANDI), said in a statement following Petro's victory.
"In us, he can expect a constructive partner," he said.
Petro was emphatic that business and development had important roles to play under his government. He has pledged to strengthen agriculture, tourism and manufacturing.