I think that it's been discussed before, but could football follow rugby's example in these instances and have the referee / 4th official wave the physio on to assess the player, whilst play continues.
Obviously doesn't work if the player is close to play or in the middle of the penalty area, but could stop some potential time wasting tactics.
Obviously doesn't work if the player is close to play or in the middle of the penalty area, but could stop some potential time wasting tactics.