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Wissa produced 12 goals and three assists last season
England striker set to start Premier League opener on Sunday
Brentford also added striker Igor Thiago for a club-record £30m in July
Chelsea are searching for another new head coach after parting ways with Mauricio Pochettino.
Thomas Frank admitted his future may lie away from Brentford amid Manchester United and Chelsea links.
Thomas Frank was this week linked with a move to Manchester United
