I hope so. Felix can at least find a new home for him to play, not only stay at the bench and does nothing. he needs play better and petter in order to get Milan's attention to make him as permanent.
As long as he can play for Milan, he will be regularly playing in UCL. I hope he won't stupid enough to go back to the Chelsea.
Hopefully this is the best chance he has to find his best form again and Milan becomes a place of revival for the Portuguese player. Milan play in the Champions League regularly and maybe it will be a good opportunity for him to prove himself that Atletico Madrid, Barcelona and Chelsea have wasted him. What he needs to do now is show consistency in his play so that Felix's presence can help improve Milan's chances even though chasing trophies this season is much more difficult.