Lindelof left the Portuguese Giants to join United last summer in a £30.75m deal.
The centre back was expected to go on and establish himself at the heart of Jose Mourinho's defence.
But the Swedish international has endured a difficult start to life at United and struggled to make an impact.
Lindelof, 23, has made just five appearances and still finds himself behind Phil Jones and Chris Smalling in the pecking order.
Some United fans are starting to question the club's decision to spend so much on Lindelof.
But his former boss Vitoria is convinced Lindelof will go on to become a huge success and he said:
"He is a very high quality player, he has been playing with Jose Mourinho.
"Of course when you move from the Portuguese championship to an English championship, so there is a phase, a stage of adaptation.
"But I do foresee that in the future Lindelof will be a player of Jose Mourinho's team. He has a lot of value, he is very cold, very competitive and has great deal of quality.''
