For quite some time, there was a theory that it was impossible for two of the best players in the world, Cristiano Ronaldo and Lionel Messi to swap clubs on FIFA 17's career mode.

Even if you had somehow managed to persuade either of their respective clubs to part ways with their star man, convincing the player to join their arch-rivals was another epic challenge in itself.

However, a video on YouTube has emerged of one gamer actually able to accomplish it to investigate how Barcelona and Real Madrid would fare if this extremely unlikely swap deal ever actually took place.

Brought to our attention by Dream Team, popular YouTuber Rich Leigh managed to sign Messi for Madrid for a fee of £15m and Ronaldo in exchange and uploaded the interesting contrasting outcomes.

You can watch the full video by scrolling down as Los Blancos began an era of La Liga dominance.

SEASON ONE

At the end of season one, Messi scored 18 in 45 games (not quite the 46 from 45 he has in real life) while Ronaldo managed 17 from 54 matches.

Madrid romped home to the title and beat Barca 5-1 in the Copa del Rey semi-finals too.

SEASON TWO

After taking a year to settle in at their new clubs, both Messi and Ronaldo rediscovered a richer vein of goalscoring form but the Argentine still edged it (38 vs 23).

Again, Madrid won the league, although they actually finished on the same points as Atletico Madrid at the top. The Catalans were still 11 points off their rivals in third.

SEASON THREE

Both players are now well past their best but that didn't stop Messi scoring 20 times in contrast to Ronaldo's meagre tally of just five.

To make matters worse, Ronaldo's Barca didn't even finish in the top four of La Liga while Madrid enjoyed a spectacular treble.

SEASON SIX

After six years at the Camp Nou, Ronaldo has decided to hang up his boots at the age of 37.

With a sprint speed of just 41 and acceleration at 28, the FIFA gods have not been kind on the Portuguese star.

Now only a backup player, he still managed to score eight goals from as many games in his swansong season.

Meanwhile, Messi's stats aren't looking too great either and just nine goals from 30 appearances prove his influence on matches is finally in decline.

For Madrid, it was another incredible campaign, winning virtually every competition they entered, including the Champions League.

So if Real Madrid are looking to find a way to dominate Spain and Europe for the next decade the answer is simple, swap Ronaldo for Messi...