The third-place finisher in Argentina's presidential election hinted Tuesday that he will support opposition candidate Mauricio Macri in the runoff vote.

Sergio Massa got 21 percent of the votes in Sunday's election, turning him into a key player in the Nov. 22 runoff. Macri got 34 percent, while governing party candidate Daniel Scioli garnered 37 percent of the vote.

Both Macri and Scioli are courting Argentines who voted for Massa. On Tuesday, Massa said that "people voted against continuity." That suggested he was closer to the changes being promised by Macri.

Massa said he would release his position Wednesday through a policy proposal manifesto, though it was uncertain if he planned to go a step further and make an endorsement.

It was also not clear how many supporters Massa might sway now that he is out of the race.

Many of his backers are, like Massa and Scioli, adherents of Peronism, a divided movement aligned with the working class founded by the late three-time president Juan Peron.

Macri shook up Sunday's vote with surprisingly strong numbers. Polls had projected that Scioli would win the election by around 10 points.

Scioli, the governor of the Buenos Aires province, had been viewed as an easy front-runner thanks to the support of President Cristina Fernandez.

Since the tight vote Sunday, Scioli has intensified his warnings to Argentines that Macri would undo popular state programs.

Still, many in the country of 41 million have grown frustrated with high inflation, strict currency controls and allegations of corruption within Fernandez's inner circle.

Macri, the Buenos Aires mayor, has branded himself as the overhaul candidate who will put Argentina's economy back on track by lifting currency controls and attracting foreign investment. He also says he will reach a deal with creditors in the U.S. whose long-running court fight with the government has made it difficult for Argentina to borrow on international credit markets.