The 22-year-old climbed the ranks at Fulham before joining Premier League club Everton and was highly regarded at Goodison Park.
However, with no first-team influence, Adeniran became a free agent that summer and attracted the interest of a wide variety of Championship and League One clubs.
Indeed, the Sheffield Star Report that both Sunderland and Hull City took late steps to seal a deal for the central midfielder.
Log In to our Sunderland AFC newsletter
The i-newsletter cut through the noise
But it appears Sheffield Wednesday won the race for Adeniran, with Darren Moore making signing the former England U19 international a priority.
According to the Star Report, the owls are close to a deal.
Sunderland is known for seeking reinforcements in midfield and that position looks even easier numerically after George Dobson joined Charlton Athletic.