The Brazilian ace joined the Spanish side on a temporary deal last winter and he has already managed 11 goal contributions.
Betis are determined to keep him on loan next season and the La Liga outfit are prepared to pay his weekly wages in full.
However, another loan deal seems unlikely on the cards. United prefer to offload Antony on a permanent basis this summer.
The club have set an asking price of £34-43 million for the former Ajax man, who is on the radar of Atletico Madrid and Arsenal.
A move to Arsenal is unlikely on the cards, considering Antony has no plans of reviving his career in the Premier League next season.
The winger has his sights on playing at the highest level in the Champions League but would prefer a move abroad than staying in England.