Bjorn Helge Riise was quoted in the Norwegian press as saying he was 'not surprised' to hear his brother had fallen out with Jol, with quotes attributed to him which questioned the managerial style of the former Tottenham boss.
Jol said he had not read the comments but said the player, who now plays for Lillestrom, had called the club to deny making the alleged inflammatory remarks.
"I haven't seen it, all I know is that he came back to Sarah (Brookes, Fulham's communications director) and he was almost crying and said it is not true," he said.
"I had a fantastic relationship with him. He said 'I never said anything' and I will take his word for it.
"Even when they have said something, because sometimes where there is smoke there is fire, you know that players will always try and get excuses because it is not nice to say you didn't play because you weren't playing good enough."