Fiorentina 'optimistic' over deal to sign Salah
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The 23-year-old enjoyed an impressive spell on loan from the Blues during the latter half of last season and has since become a target for a number of Serie A sides.
Inter and Roma have been heavily linked with an interest along with Fiorentina, but Viola president Andrea Della Valle is confident of their chances as negotiations reach a crucial phase.
"We are working on it," he told reporters in Italy.
"It's the crucial day and I'm personally optimistic. Of course, in football anything can happen but we will see what the outcome is tonight."
Salah joined Chelsea from Basel but struggled for first-team opportunities under Jose Mourinho, making just 13 appearances in the Premier League.
Former Basel head coach Paulo Sousa has recently been installed at the Artemio Franchi after the sacking of Vincenzo Montella.