Southampton signed Pablo Osvaldo from Roma on Sunday, reuniting the Italy striker with manager Mauricio Pochettino at the Premier League club.
The 27-year-old Osvaldo, who played for Pochettino at Espanyol, agreed to a four-year contract after Roma said Southampton paid a fee of 15.1 million euros ($20 million), which could rise by 2 million euros ($2.7 million) based on performances.
The end of Osvaldo's Roma career was shrouded in controversy.
At the end of last season, Osvaldo insulted Roma coach Aurelio Andreazzoli after the team was beaten in the Italian Cup final.
Italy coach Cesare Prandelli ruled that Osvaldo had breached his code of conduct, and kicked the forward off his squad for the Confederations Cup.
Osvaldo is Southampton's third signing since the end of last season, with defender Dejan Lovren and midfielder Victor Wanyama costing the south coast club more than $30 million.
