Career
As a player, he was the most capped goalkeeper of all time for HNK Rijeka. He also scored 15 goals during his time in Rijeka as he was a regular penalty kick taker. During the 1969-1970 season, he did not concede a goal for 917 minutes, a record for any Rijeka goalkeeper.
He has had two appearances for the Yugoslav national team (against Bulgaria and Israel), both in 1966.
Born in Zagreb, he started playing in a local club NK Ponikve. In his early career he also played with FK Radnički Nova Pazova from where, in summer 1958, he joined FK Jedinstvo Zemun.
In the season 1959-1960 he joined Rijeka and stayed in the club until 1972. That year he moved to FK Borac Banja Luka and played another 5 seasons there.
By the end of his career he played with Yugoslav Second League sides Metalac Sisak and HNK Segesta.
After retiring as a player at the age of 39, Jantoljak became a coach. Among other clubs, he has managed HNK Rijeka during the 1991-1992 and 1995 seasons.