Cardiff City have agreed a deal in principle to re-sign Liverpool midfielder Marko Grujic on loan, according to reports. Grujic is set to return to the Cardiff City Stadium for another season following a successful loan period last term. The Bluebirds signed the Serbian midfielder in January and he went on to make 13 league appearances in a successful promotion bid. Now in the Premier League, Cardiff City have agreed a deal in principle with Liverpool to re-sign Grujic on a season-long loan deal, according to Football Insider. Neil Warnock is working with a limited budget this season and as he looks to transform his Championship team into one capable of competing in the Premier League, he will be partly relying on loan deals. Grujic, who was part of the Serbian World Cup squad in Russua, served the Bluebirds well last season, adding a much-needed balance to the midfield in the absence of the injured Aron Gunnarsson. And he is likely to succeed again in the Premier League, where he will have more space to embrace his more natural advanced role.