The summer transfer window is heating up at St. James’ Park as Newcastle United makes a decisive move to strengthen their defensive flanks. Amid a flurry of activity across Europe, the Magpies have officially registered their interest in Sevilla’s breakout left-back, Joaquín Martínez Gauna—widely known as Oso—as the club looks to secure a bargain deal in a complex market.
The Rise of Oso: From Sevilla B to La Liga Prospect
Oso’s trajectory has been nothing short of meteoric. Initially brought into the Sevilla fold from Málaga in 2022 to develop within their reserve system, the 22-year-old made the leap to the first team in 2023. Last season, he proved his worth in the heat of La Liga, clocking 24 appearances and demonstrating the kind of tactical maturity that is rare for a player of his age.
However, the situation in Andalusia is currently precarious. With Oso’s contract set to expire in 2027 and negotiations for a renewal currently at a standstill, Sevilla finds itself in a classic financial bind. The Spanish side is under pressure to raise funds and, crucially, faces the risk of losing their prized asset for nothing if he enters the final year of his deal without an extension. This has effectively put the club in a position where a sale this summer is not just an option, but a financial necessity.
The Premier League Tug-of-War
Newcastle United is not the only club sniffing around the deal. Reports from Spain suggest that Nottingham Forest has also launched a late-minute challenge to secure the Spaniard’s signature. Both Premier League clubs have reached out to Sevilla and the player’s representatives to determine the financial requirements of a potential transfer, including the player’s personal salary expectations and the total transfer fee.
While Oso’s release clause is officially set at a steep €20 million, market reality suggests the actual price tag could be significantly lower. Transfermarkt currently values the defender at €10 million—a staggering increase from the €200k valuation he held just a year ago. For Newcastle, securing a player of his potential for anywhere near that €10 million mark would be a masterstroke of recruitment, providing elite-level competition for the left-back position without breaking the bank.
A Reasonable Deal for the Magpies?
From a strategic perspective, Newcastle United is in a strong position. The club has the financial infrastructure to handle the €20 million release clause should negotiations stall, but their preference is clearly to capitalize on Sevilla’s urgent need for liquidity. By engaging early, the Magpies are testing the resolve of the La Liga side and determining whether Oso is genuinely interested in a move to the Premier League.
For Oso, the prospect of playing at St. James’ Park—a club with European aspirations and a world-class atmosphere—could be the perfect next step in his development. As the summer progresses, the pressure will mount on Sevilla to strike a deal before their leverage disappears.
Whether this culminates in a signature or is merely part of the due diligence process for Newcastle’s recruitment team, one thing is certain: the pursuit of Oso represents a clear shift toward identifying high-upside, cost-effective talent. With the player seemingly holding the keys to his own future, all eyes will now be on the coming days to see if Newcastle can close the gap and bring the promising defender to the North East.
Do you think Oso would be a smart signing for Newcastle United, or should the club be looking for a more established Premier League veteran to bolster the defense? Is a potential €10 million fee too good to pass up? Let us know your thoughts in the comments below!


