![MLB Jersey Numbers on X: The #Mets announce that number 36 will be retired for LHP Jerry Koosman in 2020. Manager Mickey Callaway switches from number 36 to number 26. Last worn](https://www.northjersey.com/gcdn/presto/2019/06/27/PNJM/07b4b45c-c738-4246-90a4-15befd9b85ba-242f516f_00006.jpg?crop=2999,1687,x1,y506&width=2999&height=1687&format=pjpg&auto=webp)
NY Mets honor legend Jerry Koosman by retiring No. 36 jersey
![MLB Jersey Numbers on X: The #Mets announce that number 36 will be retired for LHP Jerry Koosman in 2020. Manager Mickey Callaway switches from number 36 to number 26. Last worn](https://a2.espncdn.com/combiner/i?img=%2Fphoto%2F2018%2F0313%2Fr340393_1296x729_16%2D9.jpg)
Mets retiring No. 36 of ex-pitcher Koosman in '20 - ESPN
![MLB Jersey Numbers on X: The #Mets announce that number 36 will be retired for LHP Jerry Koosman in 2020. Manager Mickey Callaway switches from number 36 to number 26. Last worn](https://cdn.vox-cdn.com/uploads/chorus_image/image/65314529/83067369.jpg.0.jpg)
Mets News: Mets to retire Jerry Koosman's number 36 in 2020. - Amazin' Avenue
![MLB Jersey Numbers on X: The #Mets announce that number 36 will be retired for LHP Jerry Koosman in 2020. Manager Mickey Callaway switches from number 36 to number 26. Last worn](https://pbs.twimg.com/media/EFQzlutWkAEbybs.png)
MLB Jersey Numbers on X: The #Mets announce that number 36 will be retired for LHP Jerry Koosman in 2020. Manager Mickey Callaway switches from number 36 to number 26. Last worn