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We discovered a strongly lensed (\mu >40) Lya emission at z=6.629 (S/N~18) inthe MUSE Deep Lensed Field (MDLF) targeting the Hubble Frontier Field galaxycluster MACS~J0416. Dedicated lensing simulations imply that the Lya emittingregion necessarily crosses the caustic. The arc-like shape of the Lya extends 3arcsec on the observed plane and is the result of two merged multiple images,each one with a de-lensed Lya luminosity L<~2.8 x 10^(40) erg/s arising from aconfined region (< 150 pc effective radius). A spatially unresolved HSTcounterpart is barely detected at S/N~2 after stacking the near-infrared bands,corresponding to an observed(intrinsic) magnitude m_(1500)>~30.8(>~35.0). Theinferred rest-frame Lya equivalent width is EWo > 1120 A if the IGMtransmission is T(IGM)<0.5. The low luminosities and the extremely large LyaEWo match the case of a Population~III star complex made of several dozensstars (~ 10^4 Msun) which irradiate a HII region crossing the caustic. Whilethe Lya and stellar continuum are among the faintest ever observed at thisredshift, the continuum and the Lya emissions could be affected by differentialmagnification, possibly biasing the EWo estimate. The aforementioned tentativeHST detection tend to favor a large EWo, making such a faint Pop~III candidatea key target for the James Webb Space Telescope and Extremely Large Telescopes.

Candidate Population III stellar complex at z=6.629 in the MUSE Deep Lensed Field