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Five minutes of stoppage time for Chesterfield to find an equaliser. Or are Preston heading for a rare win in the play-offs?

There'll be five minutes of time added on - and in the very first of those Yaser Kasim has to be brilliantly head Ryan Flynn's dangerous cross behind for a corner.

That's not a nice moment for Stefan Scougall, who becomes a substituted substitute.

The 22-year-old midfielder looks to have pulled up with a hamstring problem and, after a bit of treatment, is withdrawn for Michael Doyle. Two minutes left.

Chesterfield now making a swap as Armand Gnanduillet replaces Jay O'Shea.

Callum Robinson, on loan from Aston Villa, comes on for goalscorer Jermaine Beckford. Will his sixth-minute strike be the difference in this first leg?

Jack Stephens, where did that come from?! The Swindon centre-half strides out from the back, beats three challenges, bursts into the penalty are, holds off a further challenge - but, after all of that, can only poke it wide.

Both of these teams could be forgiven for settling for a draw heading into the final few minutes, but I don't think either are. Michael Smith almost wriggles clear inside the Sheffield United penalty area but is well tackled. Last ditch stuff.

Moments after coming on Ollie Banks has a great chance for Chesterfield. Sam Clucas receives the ball on the left and sends over a fine cross which Banks fires over the bar from a tight angle.

Is there still some late drama to come?

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We're into the final 10 minutes between Sheffield United and Swindon Town too. Is there a late sting in the tail of this first leg?

Ian Woodcock
BBC Sport at Bramall Lane

"Swindon had to weather a storm for the first 10 minutes of the match and there's a feeling they might need to do so in the final 10 too. The Blades have been second best for the majority of the second half but they've found their feet again in the last few minutes.

"Nigel Clough said before the game that the most important thing was to avoid losing, but he will know how big any kind of lead could prove to be."

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This is all Chesterfield now. They are launching attack after attack, but just lacking a bit of quality in and around the box. Ten minutes to go.

It's all going off at Bramall Lane now, as Yaser Kasim is booked for a foul on Steven Davies. Then, soon after, the former Derby and Bristol City forward first stings the palms of Wes Foderingham from distance, before very almost latching onto Stefan Scougall's cross.

On second viewing, that second opportunity really should've been taken.

The first substitutions of the game see Ollie Banks replace Dan Gardner for Chesterfield and Calum Woods and Neil Kilkenny replace Scott Laird and Paul Gallagher for Preston.

Gary Roberts almost grabs an equaliser for Chesterfield. The ball bounces around the box, Roberts hits a scuffed shot, but Sam Johnstone pushes the ball to safety.

And a second substitution for Swindon Town, as top goalscorer Andy Williams replaces Jermaine Hylton for the closing stages. Can the 22-goal striker prise an opening?

What an impact that would've been! Steven Davies tries to play new arrival Matt Done in behind Nathan Byrne, but as he looks to race clear he fouls the Swindon man. He falls over the ball and bundles it in, but the whistle had already gone.

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Preston are sitting back and soaking up the pressure. Who can make the difference for Chesterfield as we enter the final 15 minutes?

Another substitution for Sheffield United, as Matt Done, a January signing from Rochdale, replaces Jason Holt for the final 16 minutes.

That's unlucky from Ryan Flynn, who turns Jordan Turnbull inside out before driving into the penalty area and drilling a shot straight at Wes Foderingham.

Twenty minutes left in the first leg.

Almost a great chance for Chesterfield. Dan Gardner twists and turns in the box before launching a cross in from the left, it's headed on by Sam Clucas and Gary Roberts just can't get on the end of it at the far post.

Moments later at the other end Jermaine Beckford is played in by Joe Garner but his weak shot is saved by Tommy Lee.