Sunderland insist captain Granit Xhaka is not for sale this summer, rejecting Chelsea's reported interest in the midfielder after Standard Sport revealed the approach on Wednesday.
Incoming Chelsea manager Xabi Alonso drove the pursuit, having worked with Xhaka during Bayer Leverkusen's Bundesliga title-winning campaign in 2024 and officially taking the reins on July 1.
Chelsea's hierarchy concluded the squad needs greater leadership; Xhaka's age and two-year contract influenced the fee offer despite the club signing young players almost exclusively since the 2022 BlueCo takeover.
Sunderland have a "concrete interest" in signing Aston Villa's Lamare Bogarde as a potential replacement, though both Sunderland and Brighton reportedly prepare to pay a "substantial fee" for the 22-year-old midfielder.
Bogarde made 44 appearances for Villa last season as they finished fourth in the Premier League, featuring 13 times in the Europa League before the club's title-winning campaign.