Sunderland are set for their most intense summer transfer window in a while. Kristjaan Speakman comes under heavy pressure after his recent transfer business and desperately needs to redeem himself in the coming months if Sunderland are to battle for promotion. As well as bringing in new players, Sunderland will also face the huge challenge of keeping hold of their prized assets. Practically their entire starting line-up has attracted interest from the Premier League and they have already received bids for Jobe Bellingham from a number of clubs. Sunderland are eager to keep hold of the midfiel…