The playmaker is yet to consistently hit top form for the Blues since arriving for £100m from boyhood club Aston Villa last summer.
The England international, who has managed only two top-flight goals and a couple of assists this term, was unable to inspire City to victory on the south coast as their remarkable winning run ended at 12 games.
He cut a frustrated figure at times and was involved in a first-half flash point with Saints midfielder Oriol Romeu after being on the receiving end of a painful challenge from Jan Bednarek.
However, City manager Guardiola was delighted with the 26-year-old's contribution.
“It was the best game he has played since he has been with us, by far, said the Spaniard.
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