The Scottish international netted 28 league goals last season, topping the Championship scoring charts, and single-handedly keeping Leeds United in the division.
Due to a protracted and bitter move away from Elland Road, McCormack's pre-season started later than that of his new teammates, and he was forced to train alone whilst appearing in just one friendly, as he attempted to reach the high fitness levels required by manager Felix Magath.
Having reportedly injured himself in training, there were doubts concerning whether the record signing would feature in the Cottagers opening day game - an away day defeat to Ipswich Town.
However, he overcame any injury doubts and managed to start in his debut for his new employers, lasting 57 minutes and holding no influence over the negative result of the game.
He failed to register a single shot, or a single successful dribble, and he touched the ball just 27 times - the fewest amount of any Fulham starter.
For all his goalscoring credentials, he spent the majority of his shortened spell hovering around the halfway line, overshadowed by the more energetic 18-year old Moussa Dembele.
The Scot was also dispossessed twice, and failed to play any key passes - a key component of his game; he played 2.3 per game during his impressive spell with Leeds last season.
Following his substitution, he received nothing more than a short handshake from Felix Magath, who offered no comfort to his key man as promotion already appears harder than first though.
If McCormack continues to perform in the same manner, it may not be failing at promotion that worries him - it should be his entire reputation.