Simpson is a product of Arsenal's youth system and impressed whilst on loan at QPR last season, where he netted 12 goals in 34 starts. City's need for a striker has been emphasised in the opening two league games when Richard Garcia was asked to fill a lone striker role.
With Daniel Cousin having left the club for pastures new in Greece, Simpson's possible strike partners for the match with Watford will be either Caleb Folan or Mark Cullen, with Craig Fagan still sidelined. That is unless manager Nigel Pearson again opts for a 4-5-1 formation.
City fans will be hoping for an immediate impact from Simpson, who had made his desire to join City clear through his agent this week. Simpson will add pace to the attack which has been missing so far this season and he will hope to forge a quick understanding with City's other new boy Robert Koren.
Whether Pearson will stick with wide players Kilbane & Atkinson after both failed to impress at the New Den is uncertain, with both Devitt and Halmosi literally waiting in the wings for a chance to impress and both would offer a more direct attacking approach if given the opportunity.
Watford come to the KC on the back of three games undefeated this season, and have in Danny Graham a fast emerging striker of quality who has already notched four goals this season. He's likely to be partnered by former Rochdale striker Will Buckley. After the 4-0 drubbing at Millwall, the Tigers need to produce a much stronger defensive performance and it will be interesting to see whether Pearson looks to change the make up of his back four.
Paul McShane is pushing for a start either at right back or centre back and if Noberto Solano is to remain in the defence then he will need some protection from a right sided midfielder. With the transfer deadline edging nearer this will be the match which determines whether defensive reinforcements are required and Watford are sure to test its strength.
Watford's last two visits to the KC saw them concede seven times in two games, and the home fans will be hoping for something similar this time too. Hopefully a dream start for Simpson and Koren at the KC will see the Hornets sent packing stung by defeat.
Disclaimer: The views in this article are that of the writer and may not replicate those of the Professional Footballers' Association.