Adegbenro's second goal was a brilliant solo effort, beating two men before cutting to his right foot to score.
Adegbenro netted a brace for Norwegian side Rosenborg SK in their 3-2 home win against Ajax in the Europa League play-off on Thursday, August 24.
Adegbenro came in as a substitute for Milan Jevtovic in the 68th minute with Ajax leading 2-1.
Amin Younes and Lasse Schoene were the scorers for Ajax while former Arsenal striker Nicklas Bendtner scored for Rosenberg.
12 minutes after coming on as a substitute, Adegbenro scored the equaliser before netting the winner in the 89th minute.
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The second, which was the winner was a brilliant solo effort, beating two men before cutting to his right foot to fire a low drive into the corner of the net.
The 21-year-old was scored the only goal when Rosenborg got an away 1-0 win over Ajax in the first leg of the play-off.
The two-leg tie ended 4-2 on aggregate in favour of Rosenborg. They progressed to the group stage where they have been drawn in Group L with Zenit St Petersburg, Real Sociedad and Vardar.