Ziyech will join the Blues on July 1, after the two clubs concurred a charge of £37.8m for the 26-year-old.
Lampard didn’t acquire any new faces in January, in spite of their exchange boycott being lifted.
In any case, he will administer a get out toward the finish of the period, with Olivier Giroud, Pedro Rodriguez, Willian and Michy Batshuayi prone to leave.
Pedro and Giroud have just shown up between them this season.
Batshuayi is contracted until 2021, however is viewed as surplus to prerequisites at Stamford Bridge, having not made a solitary Premier League start this season.
Willian has highlighted substantially more under Lampard than Giroud, Pedro and Batshuayi, however the 31-year-old’s agreement terminates in the late spring and talks over crisp terms are not advancing.