Speaking to OKDiario, Villar addressed recent reporting by The Times that alleged Infantino had offered Morocco the World Cup final in exchange for political support, claims that prompted condemnation from several confederations and political figures, including Canadian Prime Minister Mark Carney.
Villar, who described himself as a defender of Infantino, said he did not understand the intensity of the backlash.
"You need a lot of character to be there and hold on," Villar said, calling Infantino "a good guy" and adding that he was receiving "fierce criticism for something that, in my view, he hasn't done that badly."
Infantino has also faced scrutiny over plans to sell a 20 per cent stake in World Cup commercial rights through a vehicle called FIFA Forward Enterprise, in a deal reportedly worth €4.2bn. Villar acknowledged Infantino was not beyond reproach, but suggested his overall record should be judged favourably.
"He's also human and can make mistakes," Villar said. "Whoever is perfect and hasn't made any mistakes should prove it. Weighing up his time in charge, the result is more positive than negative."
On the broader tension between FIFA and UEFA, which has included threats from the European body to withdraw its national teams from the tournament over the Morocco final allegations, Villar struck an optimistic tone, predicting reconciliation between the organisations.
"The idea that Europe wouldn't play in the next World Cup doesn't even enter my head," he said.
Villar was less certain over where the 2030 final itself would ultimately be staged. The tournament is set to be jointly hosted by Spain, Portugal and Morocco, with additional matches also played in Argentina, Uruguay and Paraguay to mark the competition's centenary - making it the first World Cup in history to be held across two continents.
"I want it to be held in Spain," Villar said. "But I also believe they should do what's best for world football."
He added that the Spanish federation would have its own reasons for pursuing a joint bid rather than pushing to host the tournament alone, despite believing the country has previously shown it can organise a World Cup independently.