Allen is expected to be added to the Rays active roster on Friday.
Allen has played in 109 big league games over the last four seasons, hitting .205 with 11 home runs, three stolen bases, and a .291 wOBA.
He has shown some pop in the minor leagues, hitting 21 home runs in just 93 triple-A games last season.
With BJ Upton expected to rejoin the Rays on Friday, it will be interesting to see who will be on the way out. Stephen Vogt will be one of the players demoted. The other could be Elliot Johnson. However, EJ is out of minor league options and would have to clear waivers.