Chelsea head coach Thomas Tuchel has confirmed Romelu Lukaku and Timo Werner face some time out after they limped off injured against Malmo.
The out-of-form Lukaku had hoped to rekindle his magic against the Swedish minnows having gone six matches without a goal for the club before this contest.
But both he and fellow striker Werner were forced off injured during the 4-0 win.
And they are likely to miss several games, according to boss Tuchel.
He said: “We have a twist of the ankle for Romelu and hamstring for Timo. They will be some days out, I guess.
“We only had Christian Pulisic, we miss everybody but we have to find excuses. We have no excuses.
“Romelu twisted his ankle with the foul in the box, Timo has a hamstring injury. It will take a while for both of them. They will be out for some matches.
“I don’t regret it. It was the moment to give him [Lukaku] confidence. Things like this can happen, it is bad luck.”
Lukaku sustained the damage in a poor tackle by Lasse Nielsen which earned the Blues their first spot-kick before Werner followed his strike-partner a minute before half-time with a hamstring problem.
Both players will be assessed at the club’s Cobham training base on Thursday.
Germany midfielder Havertz played as a central striker in the second half — combining well with Werner’s replacement Callum Hudson-Odoi for his side’s third goal and Tuchel said: “It is always a chance [for others] and always necessary to prove a point. We will have some games without Romelu and Timo now.
Tuchel also defended his decision to start Lukaku despite claiming on Tuesday that the striker’s six-game goal drought was in part due to feeling “mentally tired” from his recent exertions with Belgium.
“If I knew it before, I would not have done it,” said Tuchel of Lukaku’s injury. “But how can you know it before? It was necessary he was on the pitch. He started very strong. I spoke with him about the situation, that I think he carries a bit of a mental fatigue around with him.
“I think it is also normal but he is our number nine, he is our reference up front and the best thing against mental fatigue is a goal. We knew we can be the dominant team and we build around a fast attack with Mason [Mount] and Timo around him as the reference up front in the middle.
“I had a strong believe that in a Champions League match he could turn things around in terms of scoring and being decisive, what he actually did because he was super strong in our start. He took the foul so maybe without him it is not 2-0.
“I don’t regret it because it is not a muscle injury and the physical fatigue, it is more he is a little bit overplayed. It is my opinion. Maybe I am not even right. It was the moment to give him confident and let him play. Things like this can happen and it is bad luck.”
Chelsea now prepares for a stretch of schedule over the next two weeks across three competitions against Norwich City, Southampton, Newcastle. Malmo, Burnley.