(Photo by Julian Finney/Getty Images)Gabriel Martinelli’s Arsenal future has become increasingly uncertain, with AS Roma joining the growing list of clubs exploring a summer move for the Brazilian winger. Martinelli remains involved with Mikel Arteta’s squad, but Arsenal’s attacking rebuild has created genuine questions over his long-term position. Arsenal should only sell Martinelli for a serious offerThere is a reasonable argument for Arsenal listening to proposals. Unless the Italian club produce a substantial proposal and Arteta has a superior replacement ready, keeping Martinelli remains the safer choice. Arsenal attacker opens door to summer exit as shock club offer him a fresh start