Xavi believes Sunday's Catalan derby with Espanyol will act as a "litmus test" to determine just how much Barcelona have improved.
Barca produced arguably their finest display yet since Xavi replaced Ronald Koeman three months ago in last week's 4-2 win against Atletico Madrid.
That followed a 1-0 win over Granada, meaning the Blaugrana have won back-to-back LaLiga games for just the second time this season ahead of their trip to Espanyol.
However, not since a run of six between February and April last year have they won three games on the spin in the Spanish top flight.
Barcelona make the short trip to RCDE Stadium back in the top four and now full of confidence on the back of a successful January transfer window.
But Xavi insists his side have not fully turned a corner yet, with wins in successive away games against Espanyol and Valencia the target to keep their momentum going.
'Another final'
"Sunday's match is another final for us," he said at a pre-match news conference. "It's a litmus test and it will be a very difficult game, very intense. They will want revenge.
"We're not ruling out any targets. Being 15 points behind the leaders, with a match in hand, shows how difficult it can be. It is difficult but we do not rule anything out.
"The next few games will tell. We need several wins in a row and have to be consistent, while hoping those in front of us falter. We're fourth and we want to climb further."
Barca have now gone 23 La Liga games without defeat against their city rivals and could record the best unbeaten run by any team in any type of derby in the competition's history.
