Porto will only be able to afford Marko Grujic if Liverpool lower their asking price.
After predominantly being used as a bench player this season, the 25-year-old has become a key player for Porto in recent weeks.
The Serbia international scored the winning goal in Porto's 3-2 win over Famalicao.
Porto are keen to make his loan move permanent but are restricted by Liverpool's demands, according to Portuguese newspaper O Jogo, via Sport Witness.
The Reds want at least €20m, but that is out of Porto's price-range.
However, the Portuguese giants are waiting until the end of the season to speak with Liverpool about a potential deal.
