It was clear with the lack of opportunities Romelu Lukaku received at Chelsea that Jose Mourinho did not rate the Belgian as highly as many others did, with the Portuguese tactician prepared to move him on.
Last summer, after spending a season-long loan at Everton, Lukaku joined the Toffees on a permanent deal. He now credits Roberto Martinez for bringing about an upturn in his form during 2015, with the burly frontman having been speaking to Premier League World.
Lukaku endured a spell outside of the starting eleven at one stage and admits to finding that time difficult. He has had multiple learning curves throughout his career but needs to put his head down now and progress as a striker.
It all goes to prove how harsh football, like any field of work, can be, but it can make Lukaku twice the player he was when initially arriving at Goodison Park.
"[Martinez] left me out in December in a couple of games, and I think that was a wake-up call for me to look at myself in the mirror and say, 'Rom, you're not playing well now, you have to be serious with yourself, you have to work maybe harder,'" Lukaku told Premier League World.
"Even though I was working very hard maybe I had to give more.
"That's something that you need to learn as a young player, that when things are not going well you need to push yourself, work hard, do everything you can to get back in the starting line-up and know that the team is the most important thing."
The former Chelsea front man scored 20 goals in all competitions last season and has since been linked with a move to Manchester United, as per the Mirror.
So, despite a topsy-turvy season, Lukaku continues to be linked with some of the biggest clubs in the world. He may still prove to be a difficult player for Everton to keep hold of.
The 22-year-old intends to keep progressing, though, having admitted to finding the 2014/15 campaign tougher as a focal point of the Everton team than as a welcome loan addition.
"It's a different context to be fair, it's totally different," he continued.
"When I was here on loan last year I used to score goals and everybody would point the fingers at Chelsea like, 'Why did you let him leave?'
"Then when I come here and I don't score goals and it's, 'Why did you come?'"
Everton will look back at the season as an underwhelming campaign, finishing eleventh behind Crystal Palace and Stoke City. Like their neighbours Liverpool, they had a drastically different season to the one they had twelve months prior, so there must be something in the water on Merseyside.
Will Romelu Lakaku ever get a chance to shine on the biggest stage again?
If he doesn't, Romelu Lukaku will always look back on his time at Chelsea with regret, although it probably isn't his fault. Jose Mourinho is very specific in terms of players he likes, and the Belgian unfortunately did not fall into that category.
Granted, if Lukaku lives up to his potential then he will have another big move in his career. By using his physical presence and bullying centre-backs up and down the country, this striker can make it to the top at club level.
Building a consistent career for himself at Goodison Park is not something he or anyone in the game should stick their nose up at, though. It may be a stepping stone but as a club they should be moving forward, not backwards, after last season.