Conflict with two modules altering the same menu item?

There is a module out there (taxonomy_breadcrumb) that alters the callback from "taxonomy/term/%" to its own callback function where it then first calls the original function in taxonomy.pages.inc and afterwards modifies the output.

I would like to do a similar thing with a module of my own. But I am afraid that if my module alters the above callback to itsself and the calls the original callback function in the core module, taxonomy_breadcrumb (and any other module modifing that callback) would not work anymore.

Is there a way to prevent that like chaining callbacks or so?

Thanks!