Haikyuu!! Season 4 Confirms Jan. 10 Return!, Anime News

The second cour is also set to follow in July!

According to a Collabo Cafe article, Haikyu!! TV Anime new Season would be confirmed. : r/haikyuu

Hiroshi Kamiya - News - IMDb

Haikyuu!! Back With Season 4 in January 2020!, Anime News

Haikyuu!! Back With Season 4 in January 2020! – Anime vines

HaiKyuu!! Season 5: No words from makers still fans are hopeful about it

Haikyu!! (TV Series 2014–2020) - News - IMDb

Haikyu!! - Rotten Tomatoes

Kimizero – 04 – Let the Past Die – RABUJOI – An Anime Blog

When will Haikyuu season 4 part 2 be released? - Quora

Haikyū!! Season 4, Haikyū!! Wiki