Potential investor Mark Campbell watches Sunderland at Wembley alongside Stewart Donald - report

Campbell, who has been linked with potential investment in the Black Cats, was pictured alongside Stewart Donald with Sky Sports revealing he was present at the League One play-off final.

The Black Cats have been heavily linked with a partial takeover or fresh investment in recent weeks, and Campbell's attendance at the showpiece event could hint that news is imminent.

READ: Full details on Mark Campbell's reported interest in Sunderland and the consortium he is leadingCampbell was shown sat alongside Donald and co-owner Juan Sartori in the royal box.

It was previously reported that he was fronting a consortium interested in investing in the Black Cats, with the club's current ownership keen to secure fresh capital ahead of the new campaign.

MORE: Who is Mark Campbell? Full details on the man linked with SunderlandCampbell's consortium is believed to have links to both the US and the Far East and has also been linked with investment in Scottish side Falkirk.

Owner Donald has stressed that he will still be at the club in some capacity next season but is considering a range of options with talks ongoing.