Corrieo de Manha says the Blues have made contact with Benfica over a possible move following his impressive performances for Switzerland at Euro 2020.
Seferovic scored three goals in five appearances at the tournament, as they lost to Spain on penalties in the quarter-final.
The report states that Benfica are looking to cash in on the 29-year-old, whose value has supposedly risen from £13m to £26m following his performances for his country.
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