Chelsea have opened talks with Ajax over a move for centre-back Jorrel Hato while pushing ahead with interest in RB Leipzig forward Xavi Simons.
Hato, 19, has emerged as one of Europe's most promising young defenders after an impressive campaign in the Eredivisie, making 31 appearances.
BBC Sport understands that Chelsea are in direct communication with both Ajax and Hato's camp to explore the possibility of a summer transfer. Talks are understood to be in the early stages, with no agreement yet in place.
Meanwhile, Chelsea are discussing personal terms with Simons.
The Netherlands international, 22, is understood to be open to a move to Stamford Bridge, as the Blues look to add more creativity and attacking flair.