By the time the Blues winger was introduced to the action after 65 minutes in place of Raheem Sterling, the Young Lions were already 3-1 down.
Noel Blake's side had conceded their first goal with just two minutes played, before Nick Powell fired home the equaliser just after the half-hour mark.
But the hosts struck again in the 47th and 58th minutes to record a comfortable win in the friendly fixture.
England coach Blake felt the scoreline wasn't necessarily a fair reflection of the game.
"I'm obviously disappointed with the result tonight, but I thought we played some really good football," he said. "However, whenever you get beat it's always an issue, because you never want to get beat.
"The most disappointing thing was the way we started, conceding early goals in each half, so that concerns me and we will have to improve on that very quickly in time for the qualifiers. But it's a learning process for the team and Germany are an excellent side."
The Young Lions are back in competitive action next month for their European Championship qualifiers against Faroe Islands, Ukraine and Estonia in Tallinn.