Kubica confirmed recently that he won't be staying with Williams beyond the current season with Nicholas Latifi set to replace him.
Steiner met with the representatives of PKN Orlen yesterday, who have sponsored the Pol since the start of the year.
Kubica is likely to remain with his current sponsor which has sparked talk that the move is near completion.
Despite a tough year where he's picked up just one point, Kubica looks to have his future sorted beyond the current season.
The announcements of these two moves are expected in due course, most likely at the Abu Dubai Grand Prix.