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Standing 2.11m tall, Karlovic's huge serves and unorthodox style caused problems for some of the sport's biggest names and he won two of his three meetings with world No, 1 Novak Djokovic.
Gvardiol is Pep Guardiola's second signing in this transfer window after Croatia midfielder Mateo Kovacic joined from Chelsea.
The final at the Feyenoord Stadium ended goalless after extra time, and defeat on penalties was a further heartbreak for an expectant Croatia.
Spain capitalised on a defensive lapse to take the lead inside three minutes as Yeremy Pino produced a cool finish
Donyell Malen handed the hosts a 34th-minute lead before Andrej Kramaric equalised from the penalty spot 10 minutes into the second half.
The pinnacle of his coaching career came at the 1998 World Cup in France when Croatia finished in third place only a few years after emerging from the bloody breakup of former Yugoslavia.
The 23-year-old added a second bronze to India's tally, defeating Lithuania's Adomas Grigaliunas 5-0.
Runners-up in 2018, Croatia also came third in the 1998 World Cup, beating the Netherlands 2-1.
Croatia beat the Atlas Lions 2-1.
Messi converted a penalty to break the deadlock in the 34th minute, while Alvarez made it 2-0 five minutes later. Messi provided the assist as Alvarez scored his second in the 69th.