The commission, the EU's executive body, accused the three countries of "non-compliance with their legal obligations on relocation".
The European Commission took the Czech Republic, Hungary and Poland to the European Court of Justice Thursday over their failure to accept the required quotas for refugees.
The European Commission will announce the decision on Thursday, the sources said, stepping up a legal case it opened against the three last summer. "Whereas all other Member States have relocated and pledged in the past months, Hungary has not taken any action at all since the relocation scheme started, Poland has not relocated anyone and not pledged since December 2015 [and] the Czech Republic has not relocated anyone since August 2016 and not made any new pledges for over a year".
The refugee relocation plan was adopted in a legally binding vote by a majority of European Union member states, but not the three refusing to take part.
The bloc, however, found the trio's response unsatisfactory, saying that "the three countries have given no indication that they will contribute to the implementation of the relocation decision".
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The contentious scheme, which was introduced at the height of the refugee crisis in 2015, was focused on 'burden-sharing, ' meaning that 160,000 refugees should be relocated across these countries to ease the burden on Greece and Italy.
Responding to the move, Poland's Deputy Foreign Minister Konrad Szymanski said his nation "is ready to defend its position in the Court", and declared: "No one will lift the duty of providing public safety from the Polish government".
Critics say the higher education law aims to weaken the Budapest-based Central European University, a popular university with foreign students founded by the billionaire George Soros, who has a long-running feud with Hungarian Prime Minister Viktor Orbán.