The 20-year-old midfielder joined the Blues from Barca on Thursday for a fee of £4.36m.
The Catalan club have secured the option to re-sign the player as part of the deal, a prospect which Romeu has refused to rule out.
"You never know what can happen in the future, I will always support Barca and I hope someday I can return there," said the Spain under-20 international.
"But right now, what I want is to succeed at Chelsea and be fine there."
Barcelona's buy-back clause will allow them to re-sign Romeu for £8.7m next summer or £13.1m the summer after.