Speaking about this two players, I think Chelsea will win more games if this two players can connect, I was already thinking about this as I have written in the past then today I saw a sport journalist say the same thing while scrolling through twitter. Lukaku stamina and Timo Werner speed can be combined and they become an unstoppable force. Thomas just have to know how to achieve this and playing them together can give him a clear picture.
He should start from their training, they should train together, then play together. If the chemistry is not there at first that does not matter as with time they will know themselves better and understand their style of play and when that happens, they will be unstoppable.
Tuchel is used formation 3-4-2-1 there is only 1 attacker in front if want to combine the two players it means Tuchel will have to change formation
We know Tuchel is used to 3421 and proven effective so far I don't think he changed this formation