See the notes at Matthew 27:32.
After Jesus - Probably to bear one end of the cross. Jesus was feeble and unable to bear it alone, and they compelled Simon to help him.
Related Commentaries of Luke 23:26
Luke 23:26
26 And as they led him away, they laid hold upon one Simon, a Cyrenian, coming out of the country, and on him they laid the cross, that he might bear it after Jesus.