The Eagles now have the 23-year-old on a deal until 2021, and the contract also contains a release fee of £52.4m, but it's reported that they are prepared to let the highly-rated player leave the club for less.
The 22-year-old's arrival has been interpreted to signal the end of Smalling's spell at the club amid reported interest from their Premier League rivals Arsenal.
"The 22-year-old Swedish global centre back is a versatile defender and will make his debut on the summer tour of the US in July".
Mourinho also has England pair Chris Smalling and Phil Jones at his disposal, along with Argentina worldwide Marcos Rojo, while Dutch utility man Daley Blind has slotted into central defence on occasion.
Lindelof, who Benfica said would join United for a fee of €35 million (RM166 million), is manager Jose Mourinho's first close-season signing after winning the Europa League last month to qualify for next season's Champions League.
"Would absolutely love this signing, wonderful player and we're going to need a replacement for Valencia before too long", wrote one supporter. When you have that, you get better as well.
"He told me about the club and everything around it".
Talisca sparked a media storm after revealing that United boss Jose Mourinho wants him.
The Swede, who claimed two Primeira Liga titles with Benfica, officially completed a move to Old Trafford on Wednesday, signing a four year contract.
The Sun reports that Ronaldo has instructed his agent Jorge Mendes to "do anything possible" to force through a return to Manchester United, where he came to prominence between 2003 and 2009. It's not important to me.