Nobody could have predicted just how disastrous Radamel Falcao's brief time at Manchester United would turn out.
The Colombian international, once one of the great forwards in world football, looked a shell of his former self at Old Trafford during last season's campaign.
Struggling to recover from a nasty knee injury suffered in France, Falcao failed to make an impression in Manchester as Louis van Gaal declined to take up the permanent option in his loan agreement after just four goals.
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His expensive wages, thought to be around the £285,000-a-week mark, were well publicised last season and the Daily Mail now reports that the ill-fated season-long loan ultimately cost Manchester United the best part of £25m.
That's an extraordinary figure for such a brief stint at the club, and while Manchester United are one of the richest teams in the world, it will still sting an accountancy trained CEO like Ed Woodward.
United's deal with Monaco reportedly saw the club pay £6m up front to secure the agreement, with the Colombian international then receiving his weekly wage plus 'various bonuses'.
In all he managed just four league goals amid poor fitness and form although Manchester United did manage to secure Champions League football again at the first time of asking under Louis van Gaal.
What's all the more remarkable is the fact that United paid £25m and didn't even sign him permanently. Because it was a loan deal, that £25m is sunk cost and United couldn't even sell him on to recoup some value back - they just lost him for nothing.
Now at Chelsea, Falcao is believed to have taken a 50 per cut pay cut to secure a second chance in the Premier League.
Like United, Chelsea have an agreement with Monaco to sign the Colombian permanently at the end of next season if he hits certain benchmarks.
On last season's evidence though, it is tough to imagine the 29-year-old forward doing enough to convince Jose Mourinho to shell out what will probably be significant transfer funds to clinch his permanent signing.
What do you think Manchester United fans - one of the worst signings in your club's history?