Igoe played alongside Claridge at Portsmouth
Swindon midfielder Sammy Igoe is to join Millwall after turning down a new deal at the County Ground and accepting a one-year deal at the New Den.
The 29-year-old will be new manager Steve Claridge's first signing, having played alongside him at Portsmouth.
"He'll sign on Tuesday, it's all done. He's not going to break the bank by any means, I promise, and I'm pleased to have him here," said Claridge.
"Swindon offered him more money but he has come as he wants to prove himself."