The "just in case" part of your question is from your prospective. You want them to contact you "just in case." There is no need to risk confusing the person to whom you are communicating by addressing issues from your viewpoint. Instead, write in the language and world-view of the people to whom you are communicating.

Please have xyz contact me next week, to address any unresolved issues I may have.

The "just in case" part of your question is written from your perspective. You want them to contact you "just in case". There is no need to risk confusing the person to whom you are communicating by addressing issues from your viewpoint. Instead, write in the language and world-view of the people to whom you are communicating.

Please have xyz contact me next week, to address any unresolved issues I may have.