the reasons for lack of team cohesion are poor communication, selfishness, lack of leadership

no

Cohesion in relation to sport is what keeps a group or team together.

Factors that affect team cohesion:

How the individual members of the group feel about the group as a whole.

Reasons for being attracted to the team e.g. social reasons or to win.

Group performance - a winning team is more likely to be cohesive.

Support for the team - a supportive crowd will help cohesion.

How well team members communicate.

Leadership - a good leader will improve team cohesion.

Sense of identity - wearing the same kit improves a sense of identity and cohesion.

Friendship - people who are friends off the field often make a cohesive team on the field.

Hope this helps :)