Cattermole has been missing with injury since the end of December and his absence has been keenly felt, with results taking a turn for the worse.
Sunderland's defeat against Bradford City in the FA Cup at the weekend has piled pressure on the side and Poyet is clearly glad to have Cattermole back in his team.
“Lee Cattermole is back today and you know there will be a different kind of atmosphere and a bit of energy with that,” he said.
HITC ran a statistical analysis piece yesterday focusing on how important Cattermole has been to Sunderland this season.
Poyet spoke to the club's official website about the 'special role' he created for Cattermole earlier in the season and it has been proved that without him they are a far weaker outfit.
The 26-year-old brings a combative streak to their midfield and without him they have looked frail defensively with Liam Bridcutt, who has deputised, not offering the same sort of protection.
Cattermole's return to fitness is timely as Sunderland are currently only two points above the drop zone and looking nervously over their shoulder.
Their total of just four wins is the lowest that any side in the Premier League has managed to achieve this season and unless that tally improves significantly between now and May, they could be plying their trade in the Championship next term.