Manchester United face a battle to land Borussia Dortmund striker Robert Lewandowski.

The Daily Mail says Bayern Munich have reached an unofficial agreement with Borussia Dortmund that they will hold back from bidding for Lewandowski this summer, provided he joins them on a free transfer when his contract expires 12 months later.

The proposal has been readily accepted by Dortmund chief Hans-Joachim Watzke, who claimed he would rather keep Lewandowski another season than pocket a cut-price fee this summer, but tantalisingly added that a 'very good offer' could yet change his mind.

An offer from United of £26million is the amount needed to alter his stance.