According to The Guardian, the breakdown stemmed from a dispute between two agencies both claiming a mandate over the sale — a conflict French outlet L'Équipe reports centred on the involvement of Unique Sports Group, commissioned by Marseille owner Frank McCourt to help offload players, which attempted to renegotiate terms with a rival agency that had already brokered the initial understanding between Timber's camp and Crystal Palace.
The administrative wrangling proved impossible to resolve before Tuesday's deadline, scuppering a move that had appeared close to completion.
Crystal Palace had tabled an offer in the region of £17m for the 25-year-old, who only joined Marseille from Feyenoord in January in a deal worth around €4.5m.
Timber impressed sufficiently during the second half of last season to see his valuation climb sharply, with Marseille reportedly placing his worth closer to €18-20m by the time Palace's interest crystallised — a swift return that reflected badly on the club's finances rather than the player's form, with Marseille's American ownership having pushed for a wave of sales this summer to balance the books.
The move would have reunited Timber with his twin brother, Jurrien Timber, at a Premier League club, with the Arsenal defender having established himself as a key figure since his own move from Ajax.
Quinten had previously been a target for Manchester United, Manchester City, Liverpool and Tottenham as far back as 2023, though no deal materialised at the time and he instead remained with Feyenoord for a further three seasons before his switch to Ligue 1 in January.
Timber made 15 appearances for Marseille last season as they finished fifth in Ligue 1, missing out on Champions League qualification — a result that has since forced the club into the kind of squad-trimming that made this move possible in the first place. Several other Marseille players, including Mason Greenwood and Pierre-Emerick Aubameyang, have already departed this summer as the club worked to balance its books, with the collapsed Timber deal a rare setback in that broader effort.
He now remains at the club at least until the January window, with any fresh attempt to resolve the agency dispute likely to determine whether talks with Palace or another suitor can be revived.