Sounds like foundation problems are in your future and it's not going to magically get better by ignoring it? Sell it now and, plead ignorance if it keeps sinking/shifting, when the new owners sue you, or be forced to fix a more expensive issue when a huge crack forms and starts messing up the whole house due to subsidence. If there is rebar in the concrete, it will start to rust and destroy an even larger area with spalling.
There is a chance it's not an issue, but without knowing what damage the leak caused, it's a gamble. Maybe hire a engineering company to come evaluate the issue, if you aren't going to sell it (their report would kill plausible deniability though, right?).
Want to see what putting the problem off leads too? A structural engineering employee posts his pictures of fucked up houses on Imgur, weekly (which is rather interesting on it's own):
imgur.com/user/AlphaStructural