Marcelo Bielsa' s Whites fell behind in the 71st minute as Connor McBride's free-kick deflected past 'keeper Illan Meslier but Pascal Struijk slotted home a deflected equaliser nine minutes from time.
Summer signing from Barcelona Junior Firpo was handed his Whites debut and Lee Sobot hands out the scores from the displays at Ewood Park.
United are back in action on Friday night at Fleetwood Town, after which Leeds will take on Firpo's former side Real Betis at Loughborough University on Saturday lunch time.
The Whites then play Ajax in Amsterdam next Wednesday ahead of the new Premier League season which will begin with a clash against arch rivals Manchester United on Saturday, August 14.
United are back in action on Friday night at Fleetwood Town, after which Leeds will take on Firpo's former side Real Betis at Loughborough University on Saturday lunch time.
![6 - Played in front of Koch in the middle of the park and it was noticeable just how much he got forward to support the front line. A lovely chipped effort in the first half but quieter after the break. Photo by PETER POWELL/POOL/AFP via Getty Images](https://www.portsmouth.co.uk/webimg/QVNIMTIxNzQ0ODM4.jpg?crop=3:2&trim=&width=800)
7. Mateusz Klich
6 - Played in front of Koch in the middle of the park and it was noticeable just how much he got forward to support the front line. A lovely chipped effort in the first half but quieter after the break. Photo by PETER POWELL/POOL/AFP via Getty Images
![6 - Kept his composure to lay a square ball on for Struijk from inside the Rovers box for the 81st-minute leveller. Lots of running and the partnership with Firpo down the left will naturally develop with time. Picture by Jonathan Gawthorpe.](https://www.portsmouth.co.uk/webimg/QVNIMTIxNzQ0ODM5.jpg?crop=3:2&trim=&width=800)
8. Jack Harrison
6 - Kept his composure to lay a square ball on for Struijk from inside the Rovers box for the 81st-minute leveller. Lots of running and the partnership with Firpo down the left will naturally develop with time. Picture by Jonathan Gawthorpe.
![6 - Buzzed about across the front line in the first half, always looking for the ball and producing some neat passes. Quieter after the break and subbed for Sam Greenwood just after the hour. Picture by Jonathan Gawthorpe.](https://www.portsmouth.co.uk/webimg/QVNIMTIxNzQ0ODQw.jpg?crop=3:2&trim=&width=800)
9. Rodrigo
6 - Buzzed about across the front line in the first half, always looking for the ball and producing some neat passes. Quieter after the break and subbed for Sam Greenwood just after the hour. Picture by Jonathan Gawthorpe.
![7 - Ultimately unable to find the net or bag an assist but Rovers will be glad to see the back of him. Easily United's most dangerous player with the usual pace, flair and movement. Denied by a strong save from Kaminski. Photo by Lewis Storey/Getty Images.](https://www.portsmouth.co.uk/webimg/QVNIMTIxNzQ0ODQx.jpg?crop=3:2&trim=&width=800)
10. Raphinha
7 - Ultimately unable to find the net or bag an assist but Rovers will be glad to see the back of him. Easily United's most dangerous player with the usual pace, flair and movement. Denied by a strong save from Kaminski. Photo by Lewis Storey/Getty Images.
![6 - Started the game upfront and had a reasonable first half, showing lots of energy and getting involved. Moved to the right flank later in the game and just needed to find an end product though sent in the cross for the equaliser. Picture by Jonathan Gawthorpe.](https://www.portsmouth.co.uk/webimg/QVNIMTIxNzQ0ODQy.jpg?crop=3:2&trim=&width=800)
11. Helder Costa
6 - Started the game upfront and had a reasonable first half, showing lots of energy and getting involved. Moved to the right flank later in the game and just needed to find an end product though sent in the cross for the equaliser. Picture by Jonathan Gawthorpe.
![6 - Came on in the 61st minute for Firpo and slotted in seamlessly at left back, as you would expect from United's versatile player of the year. Can play anywhere but probably best in centre midfield now. Photo by Lewis Storey/Getty Images.](https://www.portsmouth.co.uk/webimg/QVNIMTIxNzQ0ODQz.jpg?crop=3:2&trim=&width=800)
12. Stuart Dallas (sub)
6 - Came on in the 61st minute for Firpo and slotted in seamlessly at left back, as you would expect from United's versatile player of the year. Can play anywhere but probably best in centre midfield now. Photo by Lewis Storey/Getty Images.