Pastorello says he warned Lukaku he may not get another chance to return to the Blues.
He told the Telegraph: "This is what I was telling Romelu, that it could be now or never, because probably he was not realising it 100 per cent at first.
"I had to tell him to remember that sometimes there are trains and when they pass, they don't come back. Because of the situation, because of the market and because there were not many possibilities, this was Romelu's train.
"We had the opportunity to be in the right place at the right moment and I told him that if he wanted to come back, he needed to take it now.
"Chelsea were 100 per cent sure that he was the one, I never had doubts, but I think they needed to think twice before doing it.
"There were more offers before they got to the level Inter accepted. There were four offers and the fifth was the one that closed the talks. Looking back, I think everyone got a really good deal."
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