Callum Styles suffered a setback on the brink of Euro 2024 after picking up an injury Hungary's recent friendly win against Israel.
Sunderland still have time remaining on their option to make Styles' move to Wearside a permanent one, but part of that decision will be influenced by the next head coach.
Kyril Louis-Dreyfus addressed supporters concerns last week with a statement reiterating the club's ambition ahead of next season, now 111 days without a permanent head coach after Michael Beale's sacking back in February.
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The Black Cats signed Styles on loan from League One club Barnsley in January, with an option to sign the Hungarian international this summer, if he impressed in red and white.
The 24-year-old returned to the Tykes after the curtain fell on Sunderland's Championship campaign, with the jury still out, but the cut off point for that option is understood to be later this summer.
The Black Cats will be keeping a close eye on the 24-year-old's performances at Euro 2024 this summer, after confirmation he'd be part of Marco Rossi's Hungarian side.
Styles featured in both of Hungary's final two warm-up games ahead of the tournament in Germany this summer, coming off the bench in the 2-1 defeat to the Republic of Ireland, before playing 41 minutes in the 3-0 win over Israel.
At this moment in time, it's unclear whether Styles' injury will rule him out of the Euros, which kick start next Friday. The midfielder, made the majority of his 12 appearances in red and white at left-back, but is viewed as a central midfielder by international boss Rossi.
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Elsewhere, Sunderland's defensive duo Trai Hume and Dan Ballard both started in Northern Ireland's 5-1 defeat against Spain.
The latter of the pair opened the scoring after just 66 seconds but it was the hosts who ran out comfortable winners. The Green and White Army are back in action on Tuesday night against Andorra.
Jobe Bellingham played 55 minutes for England U20s in their 2-1 win over Sweden. Goals from Dane Scarlett, who has been linked with a move to Sunderland this summer, and William Alves gave the young Three Lions the lead.
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