In an interview with CBC News, lawyer Jeff Ayotte said Del Mastro denies the allegations against him and is looking forward to fighting them in court.
"He's anxious to put this matter behind him and have his name cleared and be exonerated," Ayotte said in a telephone interview from his office in Peterborough, Ont., on Friday.
Elections Canada announced on Thursday that Del Mastro, who represents the riding of Peterborough, Ont., in the House of Commons, was facing four charges related to his 2008 election campaign.
Del Mastro and his official campaign agent Richard McCarthy are accused of wilfully overspending during the campaign and of submitting documents to Elections Canada that they knew or should have known were false.
Del Mastro faces a maximum penalty of five years in prison and a $5,000 fine.
The politician issued a statement yesterday rejecting the charges against him and confirming that he had left the Conservative caucus until the matter is settled.
Ayotte reiterated that position today.
"His position is he is completely innocent of any of the charges against him," he said.
Ayotte said he has not received any instructions to enter settlement negotiations and will instead work to move Del Mastro's case to trial as quickly as possible.
"Mr. Del Mastro is confident the trial process will clear his name so he can get back to work," the lawyer said.