The 38-year-old was recalled for last weekend's crunch clash with fellow newly-promoted side Norwich and produced several saves in the 3-1 win.
Daniel Bachmann had been first choice during the opening weeks of the season but was dropped after the defeat to Wolves and has picked up a knee injury, which opens the door for Foster to establish himself in the starting XI.
Ahead of Newcastle's visit on Saturday, Xisco said: “Ben is a top keeper. We always spoke about this positive because we have three very good goalkeepers.
“The idea against Norwich was to try give balance with experienced players like Foster, (Craig) Cathcart and Tom Cleverley because they have this experience which is very good for the team.
“Sometimes you need the balance for when you have moments of the game, because in the Premier League you cannot stay in control of the game 100 per cent. Sometimes you have the moment where you feel a little problem and in this moment the experienced players make a difference.
“I thought it was a very good performance by them three, not only what we see as players but what they give for our team in terms of mentality."
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