let f be a non-archimedean locally compact field of residue characteristic p, and let g be an inner form of gl(n,f), that is a group of the form gl(m,d) where d is a division algebra of centre f. given r an algebraically closed field of characteristic different from p, i will explain how to classify the irreducible smooth representations of g with coefficients in r, in terms of parameters involving the supercuspidal representations of the levi subgroups of g. we will discuss about the possibility of having a jacquet-langlands correspondence modulo $l$. this is a joint work with vincent s$\mathrm{\acute{e}}$cherre.