Boro’s form has dipped since the January transfer window, and they fallen down to third in the Championship table.
However, Gale has backed them to make up ground on the top two between now and the end of the season, due to the quality that they have in their squad.
“I think they’ll go up automatically, simply because they have the best players,” he said.
Boro are currently one point behind Brighton & Hove Albion, who occupy the last automatic promotion space, and five points behind league leaders Burnley.
They do have a game in hand over both the Clarets and the Seagulls, though, meaning they remain in a commanding position.
Boro’s season has recently been disrupted by the uncertainty over Aitor Karanka’s future.
Karanka did not take charge of Boro’s recent match against Charlton, which they lost 2-0, but he was back at the helm for a 1-0 win over Hull City last week.
Gale has criticised the Spanish’s boss’s conduct, suggesting that he now owes the club for taking him back.
“He’s bang out of order,” Gale added. “He owes it to the chairman, fans and the players to get promoted.”