I'd be surprised if we see Mazingue/Gaidajenko this season. Her injury sounds horrific and I hope that she is able to take all the time she needs to recover fully.
So probably a field of 23, of whom 10 will be Euros debutants. The most experienced competitors, back for the 11th Euros will be Guignard/Fabbri (together) and Saulius Ambrulevicius (between different partners, dance and singles)
Euros debut: Pinchuk/Pogorielov, Janse van Rensburg/Steffan, Polibina/Golovishnikov, Nosovitskies, Simova/Aksenov, Azroian/Gruzdev, Bjorkli/Kozuta, Sassi/Morini, Ramanauskaite/Kizala (second for him - competed in 2018 with Damuleviciute), Team AZE (though Kolosovskyi competed last year with Kuznetsova)
2nd Euros: Demougeot/Le Mercier, Holubtsova/Bielobrov, Turkkila/Versluis, Kazakova/Reviya, Ignateva/Szemko, Ippolito/Russell, Jakucs/Galli (3rd for her - competed in 2017 with Illes for Hungary)
3rd Euros: Lopareva/Brissaud, Taschlers
4th Euros: Reed/Ambrulevicius (but 8th for her and 11th for him)
5th Euros: Fear/Gibson, Manni/Rothlisberger (but first for ITA)
11th Euros: Guignard/Fabbri