Law feels their European Cup winning team would have run Barca close in last season's Champions League final.
Law said of Best: "I couldn't give him a great deal of advice. I enjoy a beer and a glass of wine at night-time, when the curtains are drawn, but not in the morning. It was sad to see with George.
"He had all the qualities a great player has - doesn't give up, gets kicked, whacked, doesn't stay out of the fray, scores goals.
"We [the Best, Law, Charlton team] would have done reasonably well against Barcelona but they played some lovely football. I enjoy watching United."