The Polish shot-stopper is reported to be attracting interest from a number of clubs, with his potential clear for all to see.
The 21-year-old has already won three senior caps for his country and has starred for Jagiellonia Bialystok since bursting onto the scene in 2007.
Chelsea were believed to be leading the chase for his signature at one stage, while Italian giants Juventus were also preparing a summer raid.
Sandomierski is, however, keen to secure regular first-team football and may opt to snub a switch to a club where he would be forced to perform back-up duties.
That could open the door for Premier League new boys Swansea to make a move, as Brendan Rodgers is understood to be weighing up an approach.
It is reported that a ?3million bid would be enough to land the youngster and his representative has confirmed that an opening offer has been received.
Barry O'Connor said: "Several clubs have expressed serious interest, one's made a firm bid."
Source: Team Talk
Source: Team Talk