On Thursday, reports emerged suggesting that Chelsea had finalized a deal for 17-year old Cristian Manea. The Daily Mail are now reporting that the Blues are closely monitoring two more teenagers, RSC Anderlecht pair Leander Dendoncker and Youri Tielemans.
Dendoncker is a 19-year old holding midfielder, who stands 6'2" tall (188cm). This has been his first season as a regular for Anderlecht, and he's now amassed about 2000 minutes of action, scoring a pair of goals.
Tielemans is currently considered the more promising of the pair, and has a little more first team experience. The 17-year old is 5'9" (176cm), and became an Anderlecht regular during the 2013/14 season. The teenager already has over 5,500 minutes of first team football, and is almost certainly ready for a stiffer challenge than he can find in Belgium.
While The Mail doesn't mention any figures when discussing the pair, one would have to imagine they'd be relatively inexpensive moves. That's two more to watch, to be certain.