As far as debut performances go, this was pretty damn bad. The former Anfield man was overrun by seemingly inferior opposition, was then booked and then five minutes later should have been sent off for a blatant foul on Royston Drenthe. So off the pace was the Argentine that Pepe Guardiola subbed him at half time.
Oh, and Barcelona lost their first home La Liga match in 16 months! Good luck Javier.