It's a bit more complicated.
Lukaku was on the other side of this when he was the ultimate first choice under Mourinho, no matter how badly he performed, constantly playing the full 90 mins no matter what the score was. It was simple, Lukaku was his striker and he always plays when fit. He'd go on about his insanely strong mentality to make it no matter what obstacle, his "grow a pair" references to players that were struggling for time on the pitch under Mourinho, how it was just an obstacle they needed to get past.
Now when he finds himself in a situation where he's no longer first choice, and rightly so given his performances over the last 12 months, he has feck all of a pre-season where he's barely involved in anything whatsoever, putting further pressure on us to accept a lowball bid from Inter.
He likes to talk big, but that's about it. There was a November interview where he ridiculed the idea that his physique wasn't good enough.
"That's some BS!" "Yeah, that's some BS. I'm one of the strongest players in the league. I never get injured. I'm always there, so what's the problem?" Lukaku added.
A month later he's blaming his form due to the fact that he gained muscles for the World Cup.