Coaches of the Houston Rockets have expressed displeasure with Jeremy Lin’s rehabilitation efforts from left knee surgery.

Lin allowed Russell Westbrook to score 19 points in 16 first-half minutes last Wednesday.

“More than a problem with his knee, what I saw again from Lin is that he is limited as an athlete,’’ was how one person with years of NBA experience put it after seeing Lin’s preseason debut. “Offensively, he should be fine. But when he has to guard opposing point guards, especially guys with speed like Russell Westbrook, he is going to really struggle.’’

Lin cites problems with his knee for his early struggles with the Rockets.

“My speed and my explosiveness and my agility (are not) there yet,” he said the other day.