Lions seal Stack deal
By Graeme Bailey
Last Updated: 01/01/70 1:00am
The 22-year-old has agreed a season-long loan deal with The Lions - who will be competing in the Uefa Cup next season.
"We are delighted to have Graham on board," Millwall's assistant boss Ray Wilkins said.
"He has shown at Arsenal that he is a top quality keeper and we are very pleased that they have let him join us for one season."
Stack will now link up with Millwall on the pre-season tour of Canada.
Meanwhile, the club have also signed Andy Marshall to a new two-year deal - who will compete with Stack for the number one jersey.
Marshall - who played in the FA Cup final for The Lions last season - arrived at the club on loan from Ipswich Town, but is now a permanent member of their squad.
"I'm so pleased this has all been finalised," said Marshall.
"I always wanted to come to Millwall. I'm delighted to be here for the start of this season because it promises to be a really exciting time for everyone at the club."