Morata looked to have made a seamless transition to English football, having scored seven times in his first eight games, but after suffering a back injury in December, has found the back of the net on just two occasions since.
It is understood he went to see a specialist in Germany earlier this year to help cure the problem.
He said: "Everything was good until I had the problems with my back".
"Your best players' performances have dropped and Chelsea did not get the correct players with the correct strengths or another top player in the summer".
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He said instead, the club should sell "four or five" players. Now it's in the past. They are 10 points behind fourth-placed Tottenham, and likely to miss out on a Champions League place.
The inform Chelsea midfielder is in peak shape and conditions despite being 29 and has revealed that a change in diet and exercise has lead to him being in the best shape of his life. That is why we are in this position now.
The midfielder was brought in by Chelsea, following the departure of mainstay Nemanja Matic to Manchester United, with the hope of recreating the N'Golo Kante - Drinkwater partnership, that had fired Leicester City to a Premier League title back in the 2015/16 season. For example, we were in control during the last game against West Ham and could have won 4-1 or 4-0 but we drewI think our target was to stay in the top four and we are fifth.
Antonio Conte will have to rotate his squad as they aim to battle for pride in the league, while providing themselves with a platform to win the FA Cup. Conte will therefore have to name a strong line up to face the south coast side, as he aims for only his second away win in 2018.