The Glovers suffered their seventh defeat of the season on Tuesday night as they went down 2-1 at home to Leicester City.
"It is a learning curve for our boys," Johnson told BBC Sport. "We haven't got that many lads with experience in the Championship like they have.
"You could see that both teams played with a tremendous amount of power and pace but they just had that little extra quality where it mattered in their two goals."
Tuesday's result has seen Yeovil slip down into the relegation zone in the Championship table.