Mercedes team boss Toto Wolff has admitted he is concerned about Valtteri Bottas.
Valtteri was very good until then," Wolff said in Abu Dhabi.
"I believe that when you have no more chances in the championship, it hurts you mentally."
There have been rumours, that Mercedes has received Bottas’ race seat for Esteban Ocon, which could mean Bottas is set to struggle psychologically through 2019 as well.
"I hope that is not what is happening," Wolff said.
"He assures me otherwise, as he is a real Finnish warrior, but now we have to get him back on his feet and in good shape."