BBC Sport
Hellberg has been in charge at Hammarby for the past two seasons and has led the Stockholm club to successive second-placed finishes in the Allsvenskan, Sweden’s highest division.
He has a year to run on his contract, meaning Swansea would have to pay a compensation fee to secure his services. However, the size of the fee is not likely to be an issue for the Welsh club.
Hellberg was in contention for a move to Wales after the departure of Luke Williams in February, only for Sheehan to land a three-year contract on the back of a sharp upturn in form at the back-end of last season.
Hellberg, who spent his playing career in the Swedish lower leagues, began his coaching career more than a…