The Polish international is currently on loan at the Italian club but recently expressed his wish to return to the Gunners next season and compete with Petr Cech for the No 1 Jersey.
Roma want to sign Szczesny on a permanent deal but Sabatini insists they have a plan in place if the 25-year-old returns to England.
“We are working on it and would like to keep Szczesny, but knowing Arsenal it will be difficult to achieve that,” said Sabatini.
“In any case, Roma are already covered in that role for next season. Who did we get? I will never tell you that!”