Tom Parker explained the 'Lego House' singer - who is friends with both the rival boy bands - has called for them to end their feud because of his closeness to both groups.
He told The Sun on Sunday: ''Ed wants to be the peacemaker. He said the whole thing is stupid and wants us to get over it because he's close to both groups.''
The suggestion came when Ed joined the 'Walks Like Rihanna' hitmakers on their US tour bus for a boozy night - and Tom admitted a similar evening could help bury the hatchet with their 'Best Song Ever' rivals.
He said: ''We're pretty close with him. We ordered bottles of Jagermeister and drank the night away. But he wanted to bed before us.
''To be honest, he ended up passed out on the bunk ... I think if we sat down [with One Direction] and got drunk together then we would probably all get on.''
It wouldn't be the first time Ed has kept the peace for Harry Styles - he previously helped defuse the situation between the singer and his ex-girlfriend Taylor Swift, who is close to the red-headed musician.
There are currently five separate teams working on 'Game of Thrones' projects at HBO.
She's a big fan of the band and this week she got to perform with them.