Sesko is out of Slovenia's friendlies this week against Hungary and Montenegro due to injury.
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Cesar accepted United's explanaton, but still wanted Slovenia’s medical staff to assess Sesko at a training camp in Ljubljana this week.
"Normally the national team is crucial for us, a little less so for them (United), but it's better for Benjamin not to train for these 14 days," said Cesar. "Our medical department immediately assessed that it would not be good for him to play.
"We have to value ourselves. We are a small country, but this is a national team. For me, and I am the responsible one, there will be no deviation here.
"Whether it’s Manchester United or Celje, you know what UEFA's national team rules are. There will be no deviation."