The Portuguese says the west Londoners will not recruit a new striker in January, defending the club's ailing forwards, while he also played down links with Southampton's Luke Shaw
The Stamford Bridge outfit were the subject of two failed bids for the England international in the summer before eventually conceding defeat in their pursuit - though the 28-year-old has so far rejected approaches to extend his deal at Old Trafford.
With the Blues' strikers misfiring this term, the west London club had been expected to move for Rooney once again in January, but Mourinho has refuted those claims and insists he would not be looking to bolster his forward line.
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The Portuguese moved to defend his own attacking players, despite a lack of goals from the likes of Fernando Torres, Demba Ba and Samuel Eto'o.
"Some strikers they are players with fantastic individual qualities and by themselves can do what the [whole] team is not able to do," Mourinho continued.
"Our strikers are not individual players, with this kind of quality or potential, they are more for the team organisation and dynamic and they do other jobs. I don't criticise them because they do other things for the team.
"The number of goals is quite frustrating not just for me but especially for them. But the contribution is good.
"Do I expect them to score a bit more? Yes. But I cannot expect Demba Ba, or Fernando to get the ball and dribble past four players and shoot, they are different players."
Mourinho also denied fresh claims centre-back David Luiz will join La Liga champions Barcelona and suggested a move for Southampton's left-back Luke Shaw was not in the pipeline.
"At this moment it is clear, he [Luiz] is our player," he added. "No [we will not bid for Shaw], the market is closed. The market opens in January but I don't think we will be there buying or selling.
"At the end of the season, of course, normally every club does it [transfer business], Chelsea does it, at the end of the season Chelsea will be analysing the situation."