Fletcher has joined Wednesday on a free transfer after leaving Premier League outfit Sunderland at the end of the 2015-16 season.
Sunderland's Steven Fletcher
Bannan has taken to Twitter to express his delight at the signing of Fletcher, and believes that the Scotland international striker will be a success at the Hillsborough Stadium.
Buzzing to see fletch has signed for us great guy and top player #wawaw— barry bannan (@bazzabannan25) July 1, 2016
Fletcher scored four goals and created eight chances in 16 Premier League appearances for Sunderland last season before joining Marseille on loan in the January transfer window.
The 29-year-old former Hibernian and Wolverhampton Wanderers striker scored two goals and created 16 chances in 12 Ligue 1 matches for Marseille.
Wednesday enjoyed a great 2015-16 campaign and reached the Championship playoff final, which they lost 1-0 to Hull City at the Wembley Stadium in London.
Carlos Carvalhal’s side will be aiming to end up in the top six of the Championship yet again next season.