One club match — or a tournament with a few in a day. The goal is to let the engine and the touch show up, and to keep one bad giveaway from pulling him out of the game.
The night before & morning of
Bag checked — boots, shin guards, the right color kit, water, a real snack for between games if it's a tournament. A real breakfast, hydration starting there. Get to the field early enough to warm up without rushing — the touch is sharper when the first-tee nerves are gone.
A light jog and dynamic movement, then get on the ball: some both-feet passing to feel the touch, a few left-foot strikes so the weak foot is awake, and — the important one — a couple of receive-and-turn reps so the first movement of the game is already in his feet. One focus going in: scan before every touch.
On the field — the one habit
The whole game comes down to one habit: look before the ball comes. Everything he's good at gets better when he already knows the picture. Remind him before kickoff, and then let his coach coach — you're not calling positions from the sideline.
Between games (if it's a tournament)
Water and off his feet first. A light snack, nothing heavy. Don't replay the last game — if it went badly, one sentence and move on. By game three the tired legs show up as a head that stops scanning, so the reminder between games is simple: eyes up, look early, the legs will follow.
His pattern is that one bad giveaway can pull him out of the game — he goes chasing the mistake instead of getting back into shape. If you see it, the message from the sideline is calm, not corrective: he already knows. What he needs is permission to let it go and get to the next play.
You're not his coach today, you're his ride and his calm. Cheer effort, not just goals — the tackle he tracks back to make matters as much as the pass. Don't coach from the touchline; his coach has that. He plays looser and braver when he knows you're just there to watch him compete.
Let him lead. If he wants to break down the game, go with it. If he's quiet, let it be quiet. Whatever happened, the one line that always works: "I loved watching you play today." Leave it there.