Valencia boss Marcelino managed the Ivory Coast defender for 18 months at Villarreal before selling him to the Red Devils for £30million in June 2016.
Bailly, 24, has suffered 12 injuries during his time with United and has managed just six starts this season.
But Marcelino said: “I was so lucky to have Eric as a footballer, as a player. He’s an extraordinary player and an extraordinary person.
“I’m so sorry for his injuries because I know his performances are conditioned by this.
“I know he is having a hard time and suffering when trying to have a stable rhythm in the team.
“I think he’s playing really well for United when he plays, but because of his injuries he’s not getting the luck he deserves.
“But I feel his youth will help him through these hard times and he will be very important for United.”
Bailly missed Saturday’s win over Fulham after impressing in the previous draw with Arsenal – his first appearance in two months.
But he trained at Carrington this morning and should feature in tonight’s final Champions League Group H game.
With Valencia unable to qualify for the last-16 but sure of third spot and a place in the Europa League, Marcelino has revealed he will ring the changes against United.
The Spanish coach is under pressure with his side struggling in La Liga, sitting 15th and just four points above the drop zone.
And Marcelino, who finished fourth with Valencia last season, admitted: “We would love to have had the chance to qualify for the next round.
“But we’ve qualified for the Europa League and our situation in La Liga is not really good, so our priority is the match against Eibar this weekend.
“We are altogether united in this opinion.”
On his own future, Marcelino added: “I know how the club thinks about me and the feelings they have for me, so I’m not doubtful in this aspect.
“I feel absolutely sure about my position in the club.”
Meanwhile, Valencia midfielder Carlos Soler is still smarting from the goal which knocked his side out of the competition.
Marouane Fellaini appeared to control the ball with his hand before he scored United’s late winner against Young Boys – a result which meant the Spaniards could no longer go through.
And Soler, 21, added: “It’s true that were it not for the hand of Fellaini, if he hadn’t scored, we would still have an opportunity.”
“Obviously we are a bit p***** off with the situation.”
Valencia likely (4-2-3-1): Domenech; Piccini, Garay, Diakhaby, Lato; Parejo, Kondogbia; Torres, Batshuayi, Cheryshev; Mina.
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