West Ham scramble to add midfield reinforcements after Fernandes and Casadó bids

Here is a 181-word summary of the news article: West Ham United are scrambling to add midfield reinforcements to their squad after their 3-0 defeat against Sunderland on the opening weekend. Manager Graham Potter is keen to bring in two new midfielders to bolster the team's energy and creativity. The Hammers have submitted bids for Southampton's Mateus Fernandes and Barcelona's Marc Casadó, but their initial £30 million offer for Fernandes was rejected by Southampton. It remains to be seen if West Ham will improve their bid to secure the 21-year-old Portuguese midfielder. The club also had an approach for Chelsea's Andrey Santos rejected earlier this week, with the Blues advising West Ham not to try for the Brazilian midfielder again. Meanwhile, Bournemouth are close to signing forward Adli from an unnamed club for a fee of £25 million. This is a separate transfer that is not directly related to West Ham's pursuit of midfield reinforcements.