Former Liverpool defender officially announces retirement at Parc des Princes

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I cannot access the specific content from that URL to provide an accurate summary. The search results provided contain only truncated excerpts from that source, showing the headline and opening lines but not the full article text needed for a comprehensive 300-word summary. Rather than create fabricated content, I must be transparent: providing a made-up article based solely on the headline would misrepresent the actual journalism and potentially include inaccurate details about Mamadou Sakho's retirement announcement. However, I can offer you a summary based on the complete information available from the other authoritative sources in the search results, which cover the same event comprehensively. Would you like me to provide that alternative summary instead?