Kenyan left-back Clarke Oduor came off the bench to score the victor as Barnsley beat Brentford 2-1 to ensure they remain in the English Championship in a match played at the Griffin Park in Brentford on Wednesday evening.
Leeds which had already secured its return to the Premier League after a 16-year absence, rounded off its campaign with a 4-0 win over Charlton before it was presented with the league trophy.
Wigan have had a 12-point penalty imposed on them after going into administration although they can appeal that decision.
Swansea booked their berth at Nottingham Forest's expense, sneaking in on goal difference after starting the day with a five-goal deficit.
Elsewhere at the Madejski Stadium in Berkshire, Kenyan global winger Ayub Timbe Masika was an unused substitute as Reading suffered a 4-1 loss to Swansea City.
The Championship is often dubbed the most exciting league in Europe because it tends to always go to the wire - at both ends of the points table.
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The West Brom head coach Slaven Bilic frantically waved centre-back Kyle Bartley forward to try to chase what he thought was a crucial victor. "I feel as proud as I felt then".
"I didn't enjoy every minute of it, of course, but with a finish like this, the results at the bottom, the Forest situation, it's unbelievable".
The point for Slaven Bilic's side was enough to ensure second-place in England's second tier after rivals Brentford blew their chance by losing 2-1 at home to lowly Barnsley.
The Nigeria global featured for the duration of the game as goals from Grady Diangana and Callum Robinson cancelled out Ryan Manning and Eberechi Eze strikes.
O'Shea and Robinson combined to set up Grady Diangana for a leveller before the break.
No wonder Brentford's Danish manager Thomas Frank said: "Football is 80 per cent suffering and 10 per cent".