The 27-year-old striker, whose future at Old Trafford remains uncertain despite David Moyes categorically ruling out a potential sale, often played second fiddle to top scorer Robin van Persie last season and was dropped by then-manager Sir Alex Ferguson for a crucial Champions League meeting with Real Madrid in March.
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|33/1||Chelsea are 33/1 with Coral to win the Premier League and Champions League
"If Wayne is a second choice for Man United, then the national team will be affected," the former Real Madrid boss said, as quoted by The Independent.
Mourinho also discussed John Terry, Ashley Cole and Frank Lampard, revealing that the English trio are setting the standard in pre-season, with Chelsea taking on Singha All-Stars in their first friendly of the 2013-14 campaign on Wednesday.
"When I see Terry, Cole, Lampard, the way they are working it's easy for me to demand the same from the other guys," he added.
"I can say 'Look that them: they don't miss one minute; they are training like animals; they compete. So you, who are 18, 19, 21, don't tell me you can't do it'."