Scout bought yesterday - injured in the first day, healed. Injured again.

[Celtic]

I was having many injuries and red cards, so I bought the best scout in my market, I was in the CL semi-finals and I really needed a top player as the auction market had nothing, so he became the best player in the team at quality 138.

I even did some mild cardio and stretching before first game so that he could "warm-up" however...

1st day (yesterday), 2 days' injury - healed.
2nd day (today), 2 days' injury again - ???

What's the explanation, was he doing dangerous exercise in some hard disk before I bought him?