Greece have handed Charalampos Kosotoulas a first senior call-up.
The Albion forward is in the squad for World Cup qualifiers at home to Scotland on November 15 and away to Belarus three days later.
Kostoulas recently scored his first Premier League goal, away to Manchester United, and then started the Carabao Cup tie at Arsenal.
His club-mate Stefanos Tzimas remains with the under-21s, for whom he scored in two Euros qualifiers during the last international window.
Greece lead Germany, who they beat recently, in their qualifying group and are facing crucial fixtures in the race for the finals.
Kostoulas, meanwhile, has been called in by senior boss Ivan Jovanovic along with midfielder Nektarios Triantis, who plays for Minessota United in MLS following stints at Sunderland and Hibernian and who turned down the chance to represent Australia.
Greece are seven points adrift with two games to go so are out of the running for a World Cup spot.
The under-21s, meanwhile, have excited fans with back-to-back wins in Germany and Latvia.
They face home games with Georgia and Northern Ireland.