The striker spent the duration of last term on loan to Championship outfit Watford and was part of the team who lost the play-off final to Crystal Palace.
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"We know what the player wants, it is no surprise for us," Giaretta told The Messaggero Veneto.
"Vydra has expressed his desire to play in the Premier League and we agree with him.
"It is important that players have objectives and he is convinced he can do well there but the most important thing is that we are well covered in attack.
"We have Antonio Di Natale, Luis Muriel, Maicosuel, Piotr Zielinski and Nico Lopez. We'd have too many if Vydra was to stay too."