Lukaku has gotten rid of Kai Havertz as Chelsea’s top scorer this season, taking his personal tally to 14 in all competitions.
And this despite only four starts in the last 18 games.
Lukaku gave Chelsea a 2-0 lead – but late goals from Francisco Trincao and Conor Coady saw the visitors to a dramatic 2-2 draw.
Tuchel was offered the chance to compliment Lukaku, the club’s record £97.5million, but insisted wasted points were his main focus.
He said: “Okay, good performance, but now is definitely not the time to be talking about individual performances and praising individual players.
“We do this as a team and we lost points, crucial points. Now is not the time to praise individuals.
Lukaku has been frustrated with his lack of first-team action after being pushed behind Havertz in the pecking order.
He’s determined to fight for his future at Chelsea – but there are serious doubts about his place in Tuchel’s long-term plans.
His team’s crumbling form immediately worries Tuchel.
Chelsea have won just one of their last five games and are now in danger of losing third place.
Arsenal can move within a point of them if they win their game in hand.
Tuchel lamented his team’s failure to see the game, adding: “We knew the risks and we have to be disciplined. We showed discipline in most parts of the first half. In situations, we touch too much risk.
“We were leading 2-0 and against it we took too many risks. We invited counter-attacks and big chances. Once you do that, you lose confidence and invite the opponent to feel like something is possible when it isn’t necessary.