The Nigerian forward opened his Hornets account with a goal against Brentford prior to the international break, before adding to his tally with strikes at Sheffield Wednesday and the opening goal in the 2-2 with Nottingham Forest on Tuesday.
He has stepped up to the first-team set-up in the absence of Troy Deeney, and it was when Ighalo was removed from play in the second half that Forest appeared to fight their way back into the game.
The former Udinese and Granada man looks to have finally settled in Hertfordshire following his season-long loan switch, and, on current form, he deserves his place in the starting line-up ahead of Deeney - despite the club captain finally returning from injury.
Ighalo’s goals have all been important for the Hornets, netting in two victories and a draw, and, despite failing to pick up three points at home to Forest, the 25-year-old is still confident that promotion to the Premier League is the target the club must aspire to.
"Promotion is still our target,” he told AfricanFootball.
“But it is too early to talk much about that. We just want to take it game by game, the league is difficult and very long.”
After the 2-2 draw with fellow promotion chasers Forest, Watford sit second in the Championship table, one point behind league leaders Derby - who moved top after a 1-0 victory at Blackpool on Tuesday evening.
The Hornets will be looking to reclaim top spot at the weekend, with a tough fixture at high-fliers Middlesbrough arranged for Saturday, and Ighalo is all but guaranteed his starting place in the team following a string of impressive performances that have been rewarded with match winning goals and vital points.