He knew his son had to leave Real after spending years in their youth ranks, and despite making a first-team debut last season.
Marcos Snr said: "I was at Real as a kid, too, but they do not respect the young players, they always look to spend money.
"I went away at 17 to join Racing Santander, played football and then moved to Barca for a million euros in 1982.
"Marcitos was right to go now. In fact, he could maybe have left a year before and he would have been playing first-team football sooner.
"I knew Bolton was right for him when I met Owen Coyle and the chairman.
"Owen spoke well about how they knew all about him. I was really surprised about that, but it showed how much they wanted him.
"I saw the team and I could tell they want to play good, passing football. My overall feeling was that this is a good, family club and right for my son."