Ilias Kasidiaris, spokesman for the Golden Dawn party, has been in hiding since Thursday when he assaulted the two left-wing politicians.
In a statement posted on Facebook on Saturday, he said he regretted becoming involved in an incident which could damage the party's image ahead of a June 17 general election but he blamed his adversaries for the attack.
"The events that took place on Thursday morning on 'Antenna TV' were staged with the sole aim of provoking an extreme reaction on my part," he wrote.
"I am sorry that without intending to, I got mixed up in a case that has confused public opinion and was aimed at hitting Golden Dawn," Kasidiaris added.
"I will go the prosecutor in person to sue those behind the illegal actions that have taken place in the last two days."
He provided no further details and no comment was available from Golden Dawn officials.
Watch from Reuters: