I feel confident with Vieirinha in the backline because he is easily the best passer out of the 4 that start so he can be incredibly useful on counters and moving the ball forward. Although I'd really like to see him in action up front running amuck in our oppositions defence and putting that lethal shot to more use.
Haven't seen enough of Jaba to comment on but Wernbloom should definitely start due to experience, skill level and endurance once he is back to being match fit.