Virgil van Dijk claims he knows nothing of interest from English clubs and is keen to prove himself in the Champions League with Celtic.
QPR loanee Tom Carroll wants to "make it at Tottenham" but is prepared to consider all of his options at the end of the season.
Jacob Butterfield's loan deal with Crystal Palace has been extended until March 17.
The Norwich midfielder moved to the Championship club during the January transfer window in order to get more playing time.
He has made five appearances since his debut against Bolton and only been on the losing side once, when the Eagles went down 1-0 at Huddersfield.
Butterfield came off the bench in their 4-1 win over Middlesbrough on Saturday, a result that was enough to move them into fourth place in the table.