Atletico Madrid manager Diego Simeone believes that Antony's speed and direct play will give the team a competitive advantage in both La Liga and the Champions League. That's why Atletico Madrid wants to transfer him. Real Betis wants to make Antony's loan deal permanent, but it may be difficult to make this transfer due to financial constraints.
From what I noticed in few sources, Antony declared in the previous months that he wants to stay with Real Betis for longer time. Considering his actual performance, more eyes were attracted to him and it is expected to see him switching sides and joining a bigger club. There is Atletico Madrid and Arsenal that seem to have serious interests in the player with side talks going on.
Although the player is comfy there, I expected him to try to join another club especially that Manchester United will try to bring back some wasted money for him since they bought him from Arsenal. Otherwise, odds to see him returning to United are slim.