Daley is set to meet Erick Silva in a welterweight bout, while Gallagher will take on Jeremiah Labiano at bantamweight from The SSE Arena, Wembley in London.
With the addition, the Bellator London lineup now includes:
Champ Gegard Mousasi vs. Rafael Lovato Jr. – for middleweight title Paul Daley vs. Erick Silva James Gallagher vs. Jeremiah Labiano Aaron Chalmers vs. opponent TBA Denise Kieholz vs. opponent TBA