Their annual study titled, "Football Clubs' Valuation: The European Elite", estimated Madrid and United as being worth €2.9billion at the end of the 2015-16 season.
Brazilian defender, Thiago Silva, has said he enjoys Champions League football in Chelsea more than PSG because of the Premier League side's previous success in Europe's elite competition.
The Argentine has had a stand-out season than any other player which gives him the edge over other players but his absence in the elite competition finals could change that.
Real Madrid have officially remained champions of Europe for the past 1,000 days and could extend the streak further if they go far in this season's Champions League competition.
On the other hand, PSG bounce back from a 2-1 first leg defeat to beat Borussia Dortmund 2-0 in France and subsequently qualify to the next round with a 3-2 aggregate win.
the final of 2017/2018 Uefa Champions League in Kiev, we take a look at five reasons Liverpool can upset the reigning champions Real Madrid, who are looking to make it the third consecutive win for the first time in the history of Europe's elite
All four Premier League sides participating in this season's competition have qualified and other top sides Europe have also booked their place into the next round.
As we all know, the most important thing in football is goals and we've seen an awful lot of them as the elite attackers in Europe treated us to all manner of finishers, whether finessed or frantically fumbled home.
The Red Devils' first test comes against Crystal Palace, a team that has had a disappointing season but has shown the ability to cause upsets, as evident in their 4-1 win over Arsenal earlier this season.
Mourinho was dismissed by United on Tuesday morning following the club's poor form this season. The Portuguese gaffer was sacked after the Red Devils were defeated 3-1 by Liverpool in the Premier League encounter at Anfield.
United finished sixth last season in the Premier League to miss out on playing in Europe's elite competition and have made a woeful start to this campaign, losing to Brighton and being humbled 4-0 by Brentford.