The former Manchester United and Juventus star, after two years out of action due to injury and a doping ban, has featured as a substitute in back-to-back games for AS Monaco.
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Mathias, who was part of the blackmail plot made against Paul, has now made a lengthy post on LinkedIn praising his brother in a sign that fractures inside he family are healing.
The former centre-forward said: "If people really knew what we went through...
"Two years of injustice, of hurtful words, of judgments and looks that could have broken anyone, but not Paul."
"Seeing you back on the pitch," he concludes, "means seeing a man who has gotten back on his feet, an example for those going through difficult times.
"Now it's your turn. The rest is yet to be written."