I don't believe there is any limit on ineligibles. I thought I had a ticket about that to show, but the closest I can come is one where I was pursuing 2 in the same season and only 1 reported - I had spent a lot more on the other one and was asking about spending vs chances to report. CS confirmed that more spending increases chances but no guarantees. They said nothing about there being any limit nor gave any indication that I couldn't have signed both players due to a limit, but since I didn't specifically ask about that, who knows for sure...