Bristol City beat Huddersfield Town 4-0 on Friday evening, boosting Newcastle's promotion hopes.
Huddersfield attempted to get back into the game, but Aden Flint's backheel handed Bristol City a third, and Cotterill made it 4-0 with a late penalty after Joe Bryan had been brought down inside the area.
The hosts netted two goals in each half, Lee Tomlin opening the scoring on the half-hour mark before on-loan Chelsea striker Tammy Abraham scored in the 14th minute of first-half stoppage-time - a head injury to Jonathan Hogg having caused a long delay early in the contest.
The 28-year-old was taken to hospital where he required two scans.
After the loss David Wagner was keen to say that this result must be seen as a one-off but he also declared 'I have never spoken about automatic promotion...', no doubt in an attempt to defuse the pressure now building on his players, with no doubt the Huddersfield boss maybe always seeing the play-offs as the most likely end result.
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The win also came at the end of a hard couple of days as Johnson's father Gary, manager of Cheltenham and one of his predecessors in the Ashton Gate hot-seat, is recovering in a Bristol hospital from a heart operation, which was carried out by the surgeon father of City defender Joe Bryan.
On Hogg's condition, Wagner added: "Jonathan has a neck injury".
"I have never spoken about automatic promotion and we now need to use the worldwide break to refresh and respond to this result, we are back in two weeks".
And Championship leaders Newcastle United, six points ahead of Huddersfield, could capitalise on the result against Birmingham City at St Andrew's this afternoon. In this sense, we can expect a close game, and with there being more than ever to play for going into this one, we can expect a good contest. Let us know in the comments section below!