Bergvall has been open to leaving Spurs, with his development having been disrupted by injuries since arriving at the club. Journalist Gianluca Di Marzio, speaking on the Tuttomercatoweb podcast, confirmed Forest as the likely source of the rejected offer and assessed Tottenham's firm stance.
"Bergvall, a Tottenham player who will perhaps find less playing time with all those signings, is working with his entourage to leave," Di Marzio said. "He's a player you think: I'll go there, maybe I'll take him on loan, offer €30m, offer €35m and they'll give him to me.
"But Napoli, who are among the most interested teams in Italy, have made an effort to understand and thought perhaps, at most, they could land him with €40m.
"Instead, Tottenham recently rejected €50m, likely from an English club, likely Nottingham Forest. And I don't think they'll go below that threshold. It will always take €50m or more."
Elliot Anderson's departure from Forest has created a vacancy in their midfield, which explains their determination to find a replacement at this level of investment.
On the Bologna front, Forest's interest is driven by two different positions. Lucumí, who was close to joining Sunderland last summer before ultimately remaining in Italy, is out of contract in 2027 — a situation that is forcing Bologna's hand and has attracted Juventus, Bournemouth and Forest.
Santiago Castro, the Argentine striker, is valued by Bologna at €40m. His availability is linked to Bologna's potential pursuit of Lois Openda from Juventus — if the Belgian arrives, Castro may be free to leave.
Forest already signed Dan Ndoye from Bologna last year, though the winger scored just once and assisted once in the Premier League last season. That has not dimmed their appetite for the club's players.