Foreign citizens are awarded honorary knighthoods which are slightly different to the regular variety. Amongst other things, holders aren’t permitted to use the title Sir or Dame.
Of the couple of thousand of these that have been handed out over the last 100 years or so, the overwhelming majority have gone to political figures. Quite a few have gone to those involved in the arts and business but when it comes to sport, a grand total of two have been recognised - Jacques Rogge, the former IOC president and Pelé. Based on that data, I don’t think it will be happening for Pep anytime soon.