Barcelona reportedly scouted Red Bull Leipzig's Timo Werner and Dayot Upamecano during the club's 2-0 defeat to Bayern Munich on Saturday.
The club's technical director Robert Fernandez took in the action at the Allianz Arena and has been "feeding back information on the duo to boss Ernesto Valverde," according to Mundo Deportivo (h/t Alex Smith at the Mirror).
Centre-back Upamecano, still just 19, is seen as a long-term replacement for 30-year-old Gerard Pique.
The France U-19 international played the whole 90 minutes against Bayern and, despite the defeat, may have impressed Fernandez, according to these statistics provided by FootballTalentScout:
If Upamecano were to arrive, he would partner 24-year-old Samuel Umtiti in the heart of the defence, potentially a pairing that could serve the club for the long term.