The 34 year old will stay with Rovers for an initial month subject to Premier League clearance.
Euell said: "The gaffer at Blackpool told me Doncaster were interested in me coming over and playing some games to help them out during their injury problems.
"I jumped at the chance because I could get some games. It's frustrating not getting games and I've spoken to Ian (Holloway) a few times about getting out to play on loan.
"Doncaster's style suits me as it's similar to Blackpool's and they were one of the clubs who gave us problems last season with their type of play."
Euell has spent most of his career playing in the Premier League and joined Blackpool on a free transfer in the summer of 2009.