Arsenal have only signed veteran Switzerland defender Stephan Lichtsteiner in a free transfer from Serie A giants Juventus in the summer transfer window so far.
Arsenal have been strongly linked with a move for the Sampdoria midfielder with talks reportedly ongoing between the club and player.
Torreira - who is now with the Uruguay squad preparing for the World Cup - is reportedly Emery's first-choice midfield target.
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Sampdoria sporting director Carlo Osti recently spoke to Rai Sport (h/t Football Italia), confirming Torreira's clause and appearing adamant the club receive that fee: "Torreira has a €25 million (£22 million) release clause, everyone knows that".
"Lucas Torreira has a release clause". Until now, Torreira has made just three substitute appearances for the national team but Unai Emery's are wary that the midfielder's valuation may rise next month with a strong World Cup showing.
The failure to qualify for the Champions League for the second season running has likely contributed to the drop in spending power and it could cause an issue when trying to sign Torreira.