Jovic has struggled for game time since his €60million arrival from Eintracht Frankfurt in June last year, with form, fitness and Zidane's preference to play Karim Benzema up front hindering the Serbia international.
United have emerged as a loan option for Jovic, while Roma, Milan and Inter have also been linked with temporary moves for the 22-year-old.
Asked about Jovic – who was handed a rare start alongside Benzema in the 3-2 win over Real Betis last week – on the eve of Madrid's LaLiga clash against Real Valladolid, Zidane told reporters: "You have to take everything into account.
"Until the fifth [of October], the market is open. We will see.
"The players are fine and that's what interests me."
Jovic endured a turbulent first season with Madrid in 2019-20 following his big-money arrival from Bundesliga outfit Eintracht, managing just two goals in 25 appearances.
The former Red Star Belgrade and Benfica forward was prised from Germany after scoring 27 goals in 2018-19 as Eintracht reached the Europa League semi-final.
Madrid have four points from two games to sit seventh in LaLiga, three points behind leaders Getafe – who have played three matches.