  Let $D$ be a weakly locally finite division ring and $n$ a positive integer.
In this paper, we investigate the problem on the existence of non-cyclic free
subgroups in non-central almost subnormal subgroups of the general linear group
${\rm GL}_n(D)$. Further, some applications of this fact are also investigated.
In particular, all infinite finitely generated almost subnormal subgroups of
${\rm GL}_n(D)$ are described.
