Galatasaray have submitted a formal bid of €45 million to sign Gabriel Martinelli from Arsenal, according to sources who spoke to ESPN.

The Turkish giants are moving decisively to secure the Brazilian winger, tabling an offer that reflects the 23-year-old's standing as one of European football's most coveted attackers.

Arsenal are yet to respond publicly to the approach, leaving the future of Martinelli — a key figure at the Emirates Stadium — uncertain heading into the summer transfer window.