Guille was a silver medallist in the individual air rifle at the 1982 Commonwealth Games in Brisbane and also attended the Edinburgh 1986 Games.
The announcement was made by the Bailiff Sir Richard Collas, who will be travelling out for the Games, and Guernsey's chef de mission Garry Collins at the official send-off reception for all the athletes and officials on Monday evening.
'I am delighted for Matthew, who I spoke to this afternoon again,' said Collins.
'He is very keen to lead out the Guernsey team at the opening ceremony.'
The opening ceremony at the Carrara Stadium takes place on 4 April.
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