Lukaku looked unhappy on the bench as Chelsea lost to Everton at Goodison Park.
The result means Chelsea has lost four consecutive matches at the Goodison Park and Thomas Tuchel has not won a game at Liverpool.
Richarlison gave the host an early second-half goal after pouncing on Cesar Azpilicueta’s error and slotting the ball calmly pass to Edouard Mendy.
Jordan Pickford was impressive on the day denying Chelsea from scoring with incredible saves, especially from Cesar Azpilicueta and Antonio Rudiger.
Chelsea controlled most of the game but could not clear-cut chances with attackers struggling to break down the Everton defense.
Thomas Tuchel was forced to make a substitution after Jorginho replaced the injured Kovacic in yhe second half.
Despite Chelsea needing a goal, Thomas Tuchel brought Christain Pulisic and Hakim Ziyech instead of the Club record signing Romelu Lukaku.
What did Tuchel say when asked why Lukaku was left on the bench?
When quizzed why the Club record signing was not brought on when Chelsea needed a goal, Tuchel replied: “Because we brought Jorginho off. We only had three changes.”
Meanwhile, Thomas Tuchel is not happy with Chelsea’s defending with Chelsea keeping one clean sheet in five matches.
Thomas Tuchel said:‘We conceded in the first minute of the second half and it became more difficult. The way we gave this goal away was absolutely unnecessary. If we keep on giving goals away it ends up in the results we have had recently.’
`We hate to lose, we are responsible for it, it was our responsibility in Old Trafford to not have more – we struggle to have consecutive clean sheets and top performances and that is why we lost today.
`We have to be without mistakes, disciplined in our positions, and don’t make mistakes.
‘When you have that much possession, we did not play our best match but we were in control, and then we gave a goal away and it kills the game for us because it is everything the opponent wants. It is a huge pattern in our season.
`We have now had four matches in the last two weeks and one clean sheet, that needs to change – if we try to get away with OK performances that are not good for us, we are a team that needs to be on the very top limit on every match basis. If we try to get away with OK we lose games.
‘We struggle with concentration and determination levels and you see that in the last four matches.’
The German tactician was not impress with Chelsea attackers.
When asked what he might do to help Chelsea’s recent attacking woes, Tuchel replied, “If there is anything I could do, I would do it.”
“The key for me is to have a clean sheet. It’s a different game against Man United, the game was more open, and there were more chances. This was more like the game against West Ham, and against West Ham, we had a clean sheet and played without any big mistakes. If you fall behind against an atmosphere like this, ins til belief in the opponent’s team, you struggle.”