Real Sociedad striker Alexander Isak is on the radar of Barcelona.

SER Catalunya says the Swede is viewed inside Barca as an alternative summer target to Inter Milan striker Lautaro Martinez.

If Barca cannot reach terms with Inter for Martinez, they'll move for Isak.

Isak's La Real contract carries a €70m buyout clause, though Borussia Dortmund have a €30m buy-back option for 2021.

Barca regard the option as steep, though could seek to drive down the cash component by including players in their offer.