Unai Emery's Aston Villa have been on the rise over the last two seasons, and have attained Champions League football for next season, something they believe they can use to attract Gallagher to their side over the competition.
Spurs and Ange Postecoglou have been long-time admirers of the 24-year-old and even looked at his availability in the January transfer window. However, they believe that Gallagher's connections with Chelsea would put him off making a move to their bitter London rivals.
As for Atletico Madrid, Diego Simeone wants the Rojiblancos to sign a midfielder who is secure in possession and they have scouted Gallagher and Luton Town's Ross Barkley, who could be on his way to Aston Villa.