Reports have suggested that Valur midfielder Haukur Pall Sigurdsson has spent time training with the Staggies in the hope of landing a permanent deal.
The 26-year-old is a goal-scoring playmaker who has spent his entire career to date in Scandinavian football.
Adams claims he has made no approach to bring the Iceland international to Scotland, with his cards being played close to his chest.
He said in the Daily Record: "I don't know where those reports are coming from. I'm not going to speak about January at the moment.
"There's always speculation at this time of the year but we don't have anyone on trial."
Adams has also refused to be drawn on speculation suggesting that he will move to land Blackburn Rovers duo Jordan Slew and Yann Songo'o on loan in the New Year.
He added: "I don't want to say anything about any players because we're just looking to the important games over the festive period."