The French winger joined Newcastle United in the off-season after failing to impress for the Red Devils but he is planning to produce his best when the Magpies travel to the reigning champions this Saturday.
"It'll be a great feeling to be back at Old Trafford - hopefully we'll win there," Obertan told the Evening Chronicle.
"I spent two amazing years there, so it'll be great to be on the pitch at Old Trafford again, to go back there and see friends I was with for two years.
"Hopefully, we'll get a good result there - it would be really, really good.
"It's all about Newcastle getting a good result now."