Translate the following English sentence to French:
"As a part of this, public authorities throughout the EU must also be jointly liable for ensuring that no contracts at all are awarded to companies whose quotations can quite clearly be traced back to the existence of undeclared work."
À cet effet, il faut compter sur la solidarité des pouvoirs publics dans toute l' UE, afin qu' ils n' attribuent aucun contrat à des entreprises dont l' offre de prix se base visiblement sur du travail non déclaré.