Alex Krassyuk, promoter and former Oleksandr Usyk manager, advises his former charge to retire, following an almighty struggle with Rico Verhoeven on Saturday. Subscribe to Seconds Out for the latest boxing news: http://goo.gl/meA2GB Follow on Twitter: http://goo.gl/VDYVMP Like on Facebook: https://www.facebook.com/secondsoutlive Follow on Instagram: https://www.instagram.com/secondsoutlive News website: https://www.secondsout.com/