The North London club managed to finish fifth in the Premier League, qualifying for the Europa League.
While Spurs are back in European competition, Romero felt they could have finished in the top four.
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One of the best seasons, but I cannot be 100 percent happy," he wrote on X.
This team deserved more, this club and its fans deserve to win! I, along with my teammates, have given everything to try and in my life I will never stop fighting to get higher and to get better every day.
Thanks to our fans for always being there, for better or for worse! London is white, come on you Spurs."