I am currently employed at company X. For a big project, I asked my manager if we could get some external consulting to provide some help and best-practices. Management agreed, and now we have an external consultant (working at company Y) a few days per week working with me on the project for the coming month.
A few days after our kick-off meeting, I was approached by a colleague of the consultant via e-mail, showing interest in my profile, and inviting me for a talk about a job opportunity. I politely declined.
Again a few days later, the external consultant itself talked to me about job opportunities at their company and showed continued interest in me and my profile as well.
Again, I declined politely, stating that I was not looking for other opportunities at this time. I didn't tell them this, but I feel this is pretty unprofessional behavior, and they should not start recruiting people away from the client to whom they are providing consultancy services. At the very least, they should wait until the current project is over.
Should I inform my manager about this?
On the one hand, I feel I should let my manager know what this firm is doing, and warn them that this might happen again in the future. On the other hand, I'm afraid this will just backfire.
If my manager reacts harshly, they may choose not to work with company Y anymore, requiring us to find another party for this and any future projects. Also, if the people at company Y found out I "told on them", they may feel reluctant to work with me again on future opportunities.