David Mackay, the chairman of the Scottish Rugby Union, last night warned that Hearts will have to renegotiate any agreement to use Murrayfield next season if they decide to remain at Tynecastle for another season rather than coming to SRU headquarters.

Chris Robinson, the Hearts chief executive, suggested at the weekend it was ''becoming increasingly likely'' that the club would delay moving from their spiritual home for a year.

Murrayfield was always looked on as a stop-gap by Robinson, but it was the lack of plans for a new ground which alienated the Hearts faithful, who were worried they might end up renting Murrayfield on a permanent basis.

The anticipated decision to stay at Tynecastle for one more season may placate supporters in the short-term, but Robinson has made it clear they will be leaving and that a new stadium won't be built on the site.

Mackay indicated yesterday any delay in entering into an agreement over Murrayfield could lead to fresh talks over the rental price. ''Hearts' decision didn't come as any major surprise,'' said Mackay. ''It is certainly a disappointment as we could do with the revenue. We could have provided a positive and mutually beneficial solution. That is still a realistic possibility and is not dead.

''If the proposal is looked at in the future, the rental agreement would also be looked at.''

A Hearts spokesman said no official decision had yet been taken and that all talk was speculation. However, Hearts will at least play their UEFA Cup matches at Murrayfield next season, as their pitch does not meet European criteria.

Dunfermline could also look at playing European ties at the venue if they draw opposition likely to attract a large crowd.