The Hungary international was also a target for the Premier League club in the summer, according to HITC Sport sources.
Nikolic, 28, joined Legia from Hungarian club Videoton FC in the summer of 2015 and has since scored 49 goals in 83 total appearances for the Polish club, helping them win the domestic double last season while finishing as the Ekstraklasa's top scorer.
The Serbian-born Hungary international, who has netted 13 times in 28 games this term, was one of Hull’s top transfer targets back in August as HITC Sport sources revealed at the time, but the problems surrounding their proposed takeover are believed to have prevented them from getting a deal done.
Manager Mike Phelan has reportedly kept up his interest in the 23-times capped forward, however, and is said to have attended Legia’s record-breaking Champions League group game at Borussia Dortmund last week when Nikolic came off the bench to score in an 8-4 defeat.
With the Polish champions now out of the competition and Europe altogether, the Tigers had been hoping to lure the prolific front man to the KCOM Stadium next month following the season-ending injury to Will Keane, but ESPN FC now claim that he is in line for a move to MLS instead.
The Fire were widely considered to be in a rebuilding year this past season under new head coach Veljko Paunovic as they finished bottom of the Eastern Conference, but general manager Nelson Rodriguez revealed at the end of their campaign that they are ready to make a big splash in the transfer market over the winter.
The club currently have two Designated Player slots opens for 2017 and recent reports have strongly linked them with a move for Manchester United midfielder Bastian Schweinsteiger after he was spotted meeting with Paunovic at a restaurant in Hale, Cheshire, last month [h/t Goal USA].
Their biggest area of need is up front, though, and Nikolic’s strike record with Legia certainly suggests that he could be the answer to their goalscoring problems.