Abstract: A method and an apparatus, applicable to a knitting machine for the production of collars and the like, for restraining while knitting end portions of cut thread (12, 13) protruding from the edge (5) of said collars into the stitches that compose them. The means for introduction (16) of said thread ends (12, 13) among two next courses of stitches comprises fluid currents (22, 32) that catch the end portions and align them to the stitches while knitting. A combing step of the end portions and stretch them when passing may be provided for. A mobile blowing head (16) and a mobile nozzle (27) are provided for suited to produce said fluid currents (22, 32) while knitting and lower in order not to interfere with thread support means (8, 28). The and portions (12, 13) are restrained among the stitches of the collar without leaving portions or loops protruding from the edge.