De Ligt – who is certain to leave Ajax at the end of the season according to manager Erik ten Hag – is one of the most sought-after defenders in Europe, where Barca is among the clubs reportedly interested.
Barca president Josep Maria Bartomeu refused to rule out a move for the 19 year-old Netherlands international in an interview during the week.
After scoring the winning goal as Ajax shocked Juventus 2-1 to reach the Champions League semi-finals 3-2 on aggregate, De Ligt was tight-lipped on his future.
Asked when he would announce his transfer to Barca, De Ligt replied: "Announce? There is nothing to announce."
When the reporter pushed him further, a smiling De Ligt said: "We're in the semi-finals of the Champions League and we're first in the league. That's enough to play for."
De Ligt and Ajax will face Tottenham in the semi-finals of the competition.