De Vrij made the move from Lazio to Inter two seasons ago. In his last season there, he played 47 games and scored 2 goals, so he earned his move.
With Antonio Conte he is an important player and has started 5 games out of 5, therefore he will be one of the starters at the Nou Camp this Wednesday.
De Vrij was wanted by Barcelona when they were on the lookout for a CB to improve the backline and be more competitive.
According to 'Calciomercato', Barcelona eventually offered more than 50 million euros i.e. a higher sum than what Inter asked for, but the deal couldn't be done and Conte trusted in him.