However, one player who may well be heading for the Madrid exit door is Gareth Bale, who came on as a substitute with nine minutes remaining and left the field sharply at full-time, though Zidane defended the Welshman.
Madrid are expected to spend heavily in the transfer market following Zidane's return, with Premier League players Paul Pogba, Eden Hazard and Christian Eriksen all reportedly targets, as well as Paris Saint-Germain forwards Neymar and Kylian Mbappe.
Kroos' first-team opportunities could be restricted by new arrivals and, while saying that he is a fan of the 29-year-old, Zidane could not confirm whether he would still be at the Santiago Bernabeu for 2019-20.
Atletico's 2-0 win over Celta Vigo on Saturday saw them move five points clear of third-placed Madrid, who had to rely on the in-form Karim Benzema to salvage a draw in a rare Monday outing.
Benzema: "Benzema can play with everyone because the good players are like that". "Here there are many players that can bring in cash for the club".
Kroos's future: "Toni is a crucial player".
They were ejected out of the Champions League at the hands of Eredivisie side Ajax and knocked out of the Copa del Rey by Barcelona, leaving the 13 time European champions with little to play for. "We will see what changes we make and which players we will change".
"The changes will be made known at the end of the season", Zidane said.