The Sun says if Souza starts against Tottenham, former club FC Lommel will be due a six-figure bonus as it will be the Brazilian's 30th appearance from the start.
However, if he begins from the bench, the Blades won't need to cough up.
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Souza has made 35 Prem appearances in total, with a further two in the FA Cup.
Sheffield United will finish bottom of the Premier League table, with just 16 points from 37 matches so far.