The 35-year-old striker re-signed for United on a one-year understanding progressing in a week. He is now still recuperating after deleterious ligaments in his knee in April.
His contingent lapse will meant Mourinho has to select between a Swede, new £90m male Romelu Lukaku and Marcus Rashford for a place adult front.
And notwithstanding scoring 28 goals in all competitions final season, a United trainer has warned Ibra that he will collect his group formed usually on form.
“Zlatan knows me and he knows that we play a players that we consider are best for a team,” Mourinho said. “I have always finished that.
“So if he comes here and he proves he is a best, he plays. If a other ones don’t give him a possibility to infer that… that is life.
“But we try always to be honest with my players and with my team. Maybe infrequently we don’t always do a scold things though we try.”
Ibrahimovic’s attainment means Mourinho will once again have 3 strikers to select from, something he pronounced will be critical if United are to plea for trophies.
“My patrol is improved for sure. It is one some-more option. It is one some-more striker. It is one some-more gifted player. It is one some-more actor that can play 9 or ten, that can play double strikers.
“We have lots of matches to play. If we swell in a Champions League and if we swell in one of a cups, we would be in a position where we couldn’t do it with usually Lukaku and Rashford, generally if we play both together.
“If we play with both, we would need another striker so substantially in Jan we would be knocking on Ed Woodward’s doorway seeking for a striker for a second partial of a season.
“Now we don’t need to hit on a door. we have one of a best in a world.”