Mendes is due to undergo more neurological tests

Mendes was knocked unconscious and suffered a seizure after Thatcher hit him with his arm in Wednesday's 0-0 draw between the two sides.

"I can confirm I'll not be taking any personal action against Ben Thatcher.

"I'm aware the Football Association have charged Thatcher. I hope they make the right decision on his punishment," Mendes told the Portsmouth website.

No formal investigation has been launched Greater Manchester Police

Thatcher has been suspended by City and charged by the FA following his challenge on Mendes. Thatcher must answer a charge of serious foul play by 12 September.

"I only saw the television replays on Thursday and was shocked by what I saw.

"I think football's governing bodies need to do everything within their power to ensure that this kind of foul play is eradicated from football.

"That kind of behaviour is just not acceptable and I leave it in the hands of the rulers of the game to act appropriately."

Mendes remains unsure when he will be able to return to first-team action.

"I'm still undergoing scans and tests as a result of the collision and am not sure at this stage when I'll be given the green light by my neurologist to return to training.

"I'm hopeful I'll not be kept out of action for too long."

Greater Manchester Police (GMP) has not launched a formal investigation because it has yet to receive a complaint from Mendes, Portsmouth or the FA.

A GMP spokesman said: "No formal investigation has been launched because no official complaint has been lodged."

The force has received a number of complaints from members of the public - thought to be Portsmouth fans - but not from any officials at the club.