Igoe, who made a fleeting appearance for The Lions at the beginning of the season, is likely to play little part in the club's final two Championship games and with his contract up in the summer he is expected to be released on a free transfer.
However, with Dave Tuttle now having departed, the 30-year-old midfielder is not giving up hope of earning a new deal just yet, although he himself admits that its highly unlikely.
"I jumped into joining Millwall when there was a new deal on the table for me at Swindon because I thought it was a good move," he told the Western Daily Press. "Then the manager was sacked and after a couple of weeks it turned into the worst thing for me.
"But there has been speculation about a management change at Millwall, so we'll wait and see what happens."
"The likelihood is that I'll be released."
Despite injury and illness, Igoe made 11 appearances for the League Two club during his three-month spell but still faces an uncertain future, with The Pirates destined to play in the same division for at least another season.
"I would like to stay with Rovers because I really have enjoyed my time with the club," continued the midfielder. "But I want to play at the highest level I can for as long as I can and I hadn't thought about League Two for another couple of years.
"There are other clubs who would be interested, but I have to weigh up my options and think about my family first.
"It's frustrating not knowing whether you are going to have to uproot your family and move. "