Leeds United have control of their Championship play-off semi-final after a controversial first-leg win over Derby County at Pride Park.

Kemar Roofe's 15th goal of the season was the difference between the teams, the forward producing an excellent first-time finish from Jack Harrison's curling pass from the left wing.

Derby were incensed when assistant referee Eddie Smart persuaded referee Craig Pawson to overturn his award of a penalty to the Rams with 14 minutes to go, after Harrison had been adjudged to have fouled Jayden Bogle.

Derby County manager Frank Lampard said: "I think it was a close call for the penalty, but for it to be overruled by a linesman who is further away than the referee is incredible.

"The ref is the boss and he made the decision. If it is going to change then surely it has to be because there is something clear and obviously wrong and there wasn't.

"Contact is minimal, but there is a foul there and I don't understand why it was changed.

"We won't get it back now but I would like to speak to the officials to understand their decision-making process."

Leeds United manager Marcelo Bielsa also said: "We always play to win and I think it was a deserved win. I am really pleased with the performance.

"Apart from the first minutes of the first half and then 10 or 15 minutes in the second half, when we dominated the ball, we defended well when we had to defend well and we attacked well when we had to attack.

"I did not have a clear view of the penalty. We are very far away from the action and have many players in front of us, so I can't give an opinion."