Having dropped an eye-watering club-record bundle on Romelu Lukaku Everton could be forgiven for having expected him to continue his upward trajectory.
Unfortunately, he has yet to emulate the form that saw him score 15 goals or more in successive loan seasons at first West Brom, then with the Toffees while still a Chelsea player.
The phenomenon of stellar loanees failing to replicate their busman’s holiday best after being rewarded with a permanent deal is nothing new, as the following trio demonstrate.
Emmanuel Adebayor – Manchester City to Tottenham
The Togolese hitman formed a lethal understanding with Rafael van der Vaart during a season-loan from Manchester City in the 2011/12 season, netting 18 times in 37 appearances.
However, everything changed when the Lilywhites shouldered the burden of his pay-packet, as he managed a mere five strikes over the next campaign.
Like some patiently-hatched Arsenal wind-up, the former Gunner has looked a shadow of his former self virtually ever since.
Robbie Keane – Internazionale to Leeds United
Morrissey’s cousin looked set for the stratosphere when he left Coventry for Milan, but fell foul of regime change at the Nerazzurri, enabling the Whites to step in and offer him a way out.
He slipped effortlessly into what was then a well-oiled machine, hitting nine goals in 12 Premier League starts (and six substitute appearances).
David O’Leary had seen enough to shell out for the Irishman by April 2001, but the following season he bagged just three times for the club as he fell down the pecking order.
Christophe Dugarry – Bordeaux to Birmingham City
The archetypal divine loan intervention, the gifted former World Cup winner was parachuted into a struggling Blues side in 2002/03, doing much to save them from relegation with a spell of five goals in four matches.
It was enough to earn the now City hall of famer a two-year deal at St Andrews, but he managed only another 15 outings before his contract was dissolved by mutual consent, with the former Barcelona man citing family reasons.
He then promptly scarpered to Qatar, where playing precisely zero times for Qatar SC before hanging up his boots.
Lukaku is 9/4 to begin paying back Roberto Martinez’s faith by netting his third goal in four Everton v Man City duels in this weekend’s Goodison Park duel.