He is training with Manchester United in a bid to improve his fitness after recovering from a long-term knee injury.
Valdes, who is a free agent, has held talks with manager Louis van Gaal over the possibility of joining United.
The 32-year-old's knee injury is currently being assessed by United staff before Valdes completes the move.
He took in the game sitting with injured United defenders Jonny Evans and Paddy McNair.
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