Falcao, 29, joined United on a season-long loan deal from Monaco on deadline day back in September, and was seen as another world class signing to go along with Angel Di Maria in the 'Gaalacticos' movement at Old Trafford.
However, the Colombian was coming off a gruesome anterior cruciate ligament injury suffered in January 2014, which ruled him out of the 2014 World Cup.
It's clear that Falcao hasn't quite recovered from that injury in the way he would have hoped, and having scored just four goals for United so far, there's a widespread belief that his time at the top of world football may have come to an abrupt end.
Regularly dropped from the United side under van Gaal this season, Falcao has had a number of low points; his invisible display against League One side Preston North End in the FA Cup was disappointing, but the Manchester Evening News believe it's something else which has prompted his desire to leave this summer.
They report that Falcao decided to move on from United after he was picked to play in the recent Under-21 match against Tottenham, and realised that he had no future at the club.
It looks as though Falcao will now return to Monaco at the end of the season, but could still make a return to the Premier League this summer.
This latest development from the Manchester Evening News may just increase Liverpool's chances of completing a surprise swoop for Falcao this summer.