Although the summer transfer window has closed, LaLiga rules allow clubs to register free agents provided there is space available in the squad.
Sevilla currently have all 25 slots filled, meaning a player must depart before Ziyech can officially join. Reports indicate third-choice goalkeeper Álvaro Fernández is likely to make way, with the club working quickly to finalise his exit.
Journalist Silvia Chaparros claims Sevilla and the 32-year-old winger have already reached an agreement, leaving only the registration process to be completed.
Ziyech, who is eager to secure a new challenge, recently left Qatari side Al-Duhail following a brief stint after his time with Galatasaray.
Before Sevilla emerged as frontrunners, the former Chelsea and Ajax star had been linked with a free transfer to Elche CF, with talks reportedly at an advanced stage.
In addition, Moroccan giants Wydad Casablanca had also expressed interest in bringing him back to the domestic league earlier this summer.
If confirmed, the move would hand Sevilla a creative boost, while offering Ziyech a fresh opportunity to revive his career in LaLiga.
Hakim Ziyech has left Al Duhail after just five months, as clubs across the Qatar Stars League begin reshaping their squads following changes to foreign player regulations.
The clock has run out for manager Javier Garcia Pimienta at Sevilla.
Super Eagles striker Kelechi Iheanacho, who joined Sevilla from Leicester City on a free transfer, faces an uncertain future after struggling for regular minutes.
Atletico Madrid boss Diego Simeone wants his charges to keep improving after a hard-fought victory over Sevilla at the weekend.
