Coutinho has only been with Barcelona a year having left Liverpool for the Nou Camp last January in a fee worth up to £142m.
But reports claim he could be on his way back to the Premier League with a host of clubs interested.
Coutinho has struggled to have the same level of impact he had at Liverpool and has now lost his starting spot with Arturo Vidal and Ousmane Dembele preferred.
And With Ernesto Valverde continuing to pick Dembele over the Brazilian, there are suggestions Coutinho may call time on his short spell in Spain.
Caught Offside claim the likes of Manchester City, Chelsea and Paris Saint-Germain are all interested in bringing him back to the Premier League, while the Reds have also been linked with re-signing him.
However, according to their sources, United have made the first move for the 26-year-old and have opened talks with Barca to determine his availability.
It remains unclear if Barca would consider cashing in on the talented midfielder but Caught Offside claim any potential deal would cost in excess of £100m.
Any possibility of Coutinho considering leaving for rival United would not sit down well with Liverpool fans either following his five-year spell with the Merseyside outfit.