A catalyst composition for the polymerization of olefinic monomers comprising a metal complex corresponding to the general formula CyLMZ p, wherein Cy represents a ligand that is bonded to the metal of the metal complex and the ligand has a cyclopentadienyl unit that is either unsubstituted or substituted with one or more substituent selected from C 1-20 -linear, branched or cyclic alkyl substituents, C 6 -C 12 aryl substituents, and trialkyl silanes, wherein the linear or branched alkyl substituents may be unsubstituted or may be substituted themselves by one or more halogens and wherein the cyclic alkyl substituents and aryl substituents may be unsubstituted or substituted themselves by one or more halogens, one or more C 1 to C 10 linear or branched alkyls, one or more C 1 to C 10 linear or branched oxoalkyls, C 5 - C 10 -cycloalkyls, dialkylamino groups which C 1 to C 6 alkyls and combinations thereof,, M is the metal of the metal complex and is selected from a group 4 metal, Z is selected independently from neutral or anionic ligands bonded to the metal M, wherein the neutral ligands are selected from conjugated dienes having from 4 to 40 carbon atoms which, optionally, may be substituted once or more than once with a substituent selected from the group consisting of hydrocarbyl, silyl, halogenated carbyl and combinations thereof, and wherein the anionic ligands are selected from the group consisting of -H, -F, -Cl, -Br, -I, -pseudohalogen, -C 1-12 -alkyl, -O-C 1-12 -alkyl, -C(=O)C 1-12 -alkyl, -acetylacetonate, a biscarboxylate of a C 1-12 alkyl, -phenyl, -O-phenyl, -Si(C 1-12 -alkyl) 3, -Ge(C 1-12 -alkyl) 3, -N(C 1-12 -alkyl) 2, -P(C 1-12)-alkyl) 2, -S-C 1-12 -alkyl, all present in their anionic forms, and combinations thereof, p is 1 or 2, and L is an amidinate ligand of the formula wherein the amidine-containing ligand is covalently bonded to the metal M via the imine nitrogen atom and Sub 1 represent either an aliphatic and cyclic or an aromatic substituent and Sub 1 contains from 6 to 20 carbon atoms and Sub 2 corresponds to the general formula - NR 1 R 2 wherein R 1 and R 2 are identical or different and are selected from acyclic, linear or branched, saturated aliphatic hydrocarbon residues having from 4 to 24 carbon atoms and wherein either R 1 and R 2 are both linear or R 1 is linear and R 2 is branched and wherein the hydrocarbon chain of R 1 or R 2 may be interrupted once or more than once by an oxygen atom or a nitrogen atom, or may contain one or more halogen atoms. Cy represents a ligand that is bonded to the metal of the metal complex and the ligand has a cyclopentadienyl unit that is either unsubstituted or substituted with one or more substituent selected from C 1-20 -linear, branched or cyclic alkyl substituents, C 6 -C 12 aryl substituents, and trialkyl silanes, wherein the linear or branched alkyl substituents may be unsubstituted or may be substituted themselves by one or more halogens and wherein the cyclic alkyl substituents and aryl substituents may be unsubstituted or substituted themselves by one or more halogens, one or more C 1 to C 10 linear or branched alkyls, one or more C 1 to C 10 linear or branched oxoalkyls, C 5 - C 10 -cycloalkyls, dialkylamino groups which C 1 to C 6 alkyls and combinations thereof,, M is the metal of the metal complex and is selected from a group 4 metal, Z is selected independently from neutral or anionic ligands bonded to the metal M, wherein the neutral ligands are selected from conjugated dienes having from 4 to 40 carbon atoms which, optionally, may be substituted once or more than once with a substituent selected from the group consisting of hydrocarbyl, silyl, halogenated carbyl and combinations thereof, and wherein the anionic ligands are selected from the group consisting of -H, -F, -Cl, -Br, -I, -pseudohalogen, -C 1-12 -alkyl, -O-C 1-12 -alkyl, -C(=O)C 1-12 -alkyl, -acetylacetonate, a biscarboxylate of a C 1-12 alkyl, -phenyl, -O-phenyl, -Si(C 1-12 -alkyl) 3, -Ge(C 1-12 -alkyl) 3, -N(C 1-12 -alkyl) 2, -P(C 1-12)-alkyl) 2, -S-C 1-12 -alkyl, all present in their anionic forms, and combinations thereof, p is 1 or 2, and L is an amidinate ligand of the formula wherein the amidine-containing ligand is covalently bonded to the metal M via the imine nitrogen atom and Sub 1 represent either an aliphatic and cyclic or an aromatic substituent and Sub 1 contains from 6 to 20 carbon atoms and Sub 2 corresponds to the general formula - NR 1 R 2 wherein R 1 and R 2 are identical or different and are selected from acyclic, linear or branched, saturated aliphatic hydrocarbon residues having from 4 to 24 carbon atoms and wherein either R 1 and R 2 are both linear or R 1 is linear and R 2 is branched and wherein the hydrocarbon chain of R 1 or R 2 may be interrupted once or more than once by an oxygen atom or a nitrogen atom, or may contain one or more halogen atoms. wherein the amidine-containing ligand is covalently bonded to the metal M via the imine nitrogen atom and Sub 1 represent either an aliphatic and cyclic or an aromatic substituent and Sub 1 contains from 6 to 20 carbon atoms and Sub 2 corresponds to the general formula - NR 1 R 2 wherein R 1 and R 2 are identical or different and are selected from acyclic, linear or branched, saturated aliphatic hydrocarbon residues having from 4 to 24 carbon atoms and wherein either R 1 and R 2 are both linear or R 1 is linear and R 2 is branched and wherein the hydrocarbon chain of R 1 or R 2 may be interrupted once or more than once by an oxygen atom or a nitrogen atom, or may contain one or more halogen atoms.