Lalonde Gordon, the Olympic bronze medallist from Trinidad and Tobago, is by far the fastest man among the entrants having run 45.17 this winter.
His compatriot Deon Lendore, the current world leader with 45.03, will be focusing on the NCAA Championships and so won't be in Sopot, but Trinidad and Tobago still have a great shot of the gold medal with Gordon.
Dominican Republic’s Olympic silver medallist Luguelin Santos and Costa Rica’s 2012 World Indoor Championships winner Nery Brenes are also in the field but next quickest on season’s bests are the one-two from the US Championships, Kyle Clemons and David Verburg.
Czech Republic’s reigning European champion, indoors and outdoors, Pavel Maslek and Great Britain’s Nigel Levine should also feature.
Simon Turnbull for the IAAF