Larsen struck in the 2-1 win to secure Celta's Primera status.
He said, "I'm very happy. The game in Granada was very difficult because we didn't get there in the first half but in the end we won.
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"We are saved and we don't have an ending like last year.
"I scored a goal and gave an assist, but in the end the team was better, although we should have defended better in the last ten minutes."