Manchester United are subsidizing tickets for their supporters for the UEFA Champions League quarter final against Barcelona.
Barcelona raised the prices for away fans to £102, the highest for a United game this season.
But United are only taking £75 from their supporters.
They will cover the rest of the cost and make it up by adding it to the figure Barca supporters must pay for the Old Trafford leg.
A letter sent to United fans from the club read: "FC Barcelona confirmed our tickets for this game were to be priced at £102. In this instance we believe that our travelling supporters are again being subjected to increased/excessive ticket prices from the host club.
"Similarly to Valencia in the group stages and Sevilla FC away last season, we have again taken the difficult decision to charge FC Barcelona fans for the home leg at Old Trafford the same amount that FC Barcelona are charging for the away fixture (£102).
"We will use the additional revenue gained from this to subsidise our travelling support by paying the £27 price difference for each of our travelling supporters."