William Gallas admits he was frustrated by Arsenal's medical staff after being misled over the extent of his thigh injury.
The Frenchman returned to the Arsenal side in February following a three-month lay-off, but he had expected to be back in action much sooner and claims the club's medics diagnosed his problem incorrectly.
"It has been my most difficult season for a long time," he told L'Equipe.
"The most difficult part was remaining unclear. If I had known from the beginning that I would need three months, I would have accepted it.
"But at first they told me it was a cramp, when in fact it was a strained muscle.
"Do I have something against the Arsenal medical staff? A little, yes, with the error in diagnosis.
"The doctors did then do their best for me to come back, but in the end my season has not been satisfying."
Gallas also concedes it has been difficult to play for such an inexperienced side after leaving Chelsea last August.
He believes Arsenal's young players are full of promise but must learn quickly to turn good performances into winning results.
"I knew the Arsenal team was young, but day after day I have come to understand they really miss experience," he explained.
"We made mistakes that experienced players would never do.
"When I left Chelsea I knew we would remain behind for at least one year.
"We play very, very good football, but that is not enough. We have to fight, and have a killer instinct in front of the goal.
"We can't always rely on Thierry and the youngsters have to understand it.
"Our young players have to do more."
I wonder if he regretted joining arsenal..