`Chelsea used to defend very strongly. Their defense was so good that when they conceded a few times, people would see it as a problem,` Hasselbaink commented on Sky Sports.
Chelsea held the ball 80% of the time, shot 10 times towards goal but could not beat Everton.
Chelsea has conceded six consecutive matches since their 4-0 victory over Juventus in the Champions League on November 24.
`Chelsea lost wasted goals because some individuals were not focused,` Hasselbaink added.
Besides psychological factors, Hasselbaink believes that the injury situation and Covid-19 cause coach Tuchel to lack options when drafting the squad.
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Lukaku has just scored 5 goals in 16 matches for Chelsea in all competitions.
Lukaku’s recent form also makes Chelsea worried.
Hasselbaink advised Chelsea to continue to trust Lukaku.
Hasselbaink is the fourth best international striker in Premier League history, with 127 goals.