Ghanaian youngster Majeed Ashimeru provided an assist but it was enough as St Gallen were beaten at home by FC Basel in Swiss Super League on Saturday.
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The former WAFA star found Sierro with a delightful pass to open the scoring for Gallen but Basel fought back and deservedly won the match 3-1.
He played the full throttle of the game but the defeat leaves the Espen in 5th position after 10 matchdays.
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Ashimeru has featured in all of Gallen's games this season, impressing greatly.