Suarez signed a new long-term contract at Liverpool in December but reports in Spain suggest there is a release-clause in that deal.
And in a huge blow to Liverpool's chances of keeping the Uruguayan at Anfield, the fee is even lower if either of Spain's big two make a move for the 27-year-old.
That could mean that either Real or Barca would only have to offer £52m to force Liverpool to allow them to talk personal terms with Suarez.
And that fee could be even lower if - as reported - Barcelona are willing to include Alexis Sanchez in the deal.
Alexis Sanchez Player Profile
Liverpool failed to honour Luis Suarez's release clause last summer
There is hope for Liverpool fans however, in that the Reds have a history of ignoring clauses that don't suit them.
Last summer Arsenal made an offer of £60m plus £1 in the hope of triggering the clause only to have the bid knocked back by Liverpool.
However, in March Liverpool owner John W. Henry admitted that Suarez did have a £60m clause in his contract but the club gambled that Arsenal would not go to court if they failed to honour it.
It now remains to be seen whether either Real or Barcelona encounter a similar problem should the meet the reported fee this time around.