However, Leeds had made all three of their substitutions, meaning an outfield player needed to go in goal.
And Leeds’ star defender Jansson, who was limping after picking up an injury during the game, put Casilla’s shirt on and went between the sticks.
Luckily for Leeds, Jansson didn’t have to make a save during his time with the gloves on.
The defender even charged forward for a corner with a couple of minutes remaining.
Kiko Casilla was sent off late in the match for bringing down Billy Sharp (Image: REX)
And Jansson, who was already injured, pulled on the gloves after a team discussion (Image: REX)
The results means Marcelo Balsa’s side missed the opportunity to move five points ahead of the Blades.
They are now down to third, two points off Norwich having played a game more.
The Whites have eight matches remaining with Millwall the visitors to Elland Road next weekend before trips to Birmingham and Preston.
Championship leaders Norwich play Rotherham this afternoon before clashes with Middlesbrough and Queens Park Rangers.
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Jansson did not have a save to make during his spell between the sticks (Image: REX)