No.
We have adequate cover in Fabio.
We also need to consider who we could attract as cover for Rafael. They will know they are only coming in as cover so in reality,we'd only attract either somebody young (can't imagine anybody better than Fabio or Varela as young talent) or a versatile player who can get games in a number of positions (can't imagine we could get anybody better than Jones/Valencia) or a journeyman after a pay day (who would be better than what we have?).
Are people citing Fabio as adequate cover blind or have they been living under a rock for the last year?
He has "played" 2 games for us this year, 1 in the League and 1 in the League Cup. The League Cup game consisted of about 3 minutes of football against Norwich when he came on for Januzaj in the 90th minute while the League game was 5 months ago and since then he has only even made the bench 5 times. Now in what world does that constitute "adequate cover"?