Admission letters have been sent to all Champions League participants, European football's governing body UEFA has said.
A source told ESPN that the invite to the competition is purely administrative and has no bearing on the separate disciplinary process being carried out as a result of their involvement in the failed European Super League project.
Disciplinary proceedings against Juve, Barca and Real over their involvement in the proposed ESL have been suspended by UEFA's independent appeals body.
UEFA opened a probe against the three clubs, but last week it suspended proceedings after being notified by the Swiss authorities of a court order from the commercial court in Madrid obtained by the legal entity European Super League Company SL.
"Admission letters have been sent to all clubs participating in next season's UEFA club competitions today," UEFA told Reuters on Tuesday.
Juve, Barca and Real are the last of the 12 clubs who signed up to the Super League in April not to have distanced themselves from the breakaway project, which unravelled when all six English clubs plus Inter Milan, AC Milan and Atletico Madrid withdrew.
ESL founder and Juventus chairman Andrea Agnelli said earlier this month that the plan to create a breakaway league was not a coup but a way to save the football industry, which has been hit by the coronavirus pandemic.
Juve qualified for the Champions League on the final day of last season's Serie A campaign and have since changed coaches, with Massimiliano Allegri back for a second spell.