The two 21-year-olds both play for Swedish side AIK Solna, and Toon boss Alan Pardew has been tracking them for months.
AIK sporting director Jens Andersson said: "The interest has not faded, it is as strong as a few months ago.
"They have become better and better. Foreign clubs see them in each game, and they know what class they have.
"There are more now than earlier this spring that follow Teteh and Mohamed."