The Black Cats are fighting with Newcastle United and Norwich City for survival.
The Blacks Cats drew 0-0 with Arsenal on Sunday, in a game that saw them claim a crucial point in their fight against relegation.
The result took them out of the bottom three for the first time in seven weeks, as they pushed Norwich City into 18th position in the table.
There is no points gap though, with both sitting on 31 at present, and Newcastle United sitting on 30 behind them meaning the relegation race is set to go down to the wire.
And Henry says Sunderland's current goal tally, which is significantly better than their rivals’, could be massive to their hopes.
"It's a tough one. The only thing I'd say is that momentum is with Sunderland and Newcastle with their results,” he told Sky Sports.
"You could say that Crystal Palace and Aston Villa are 'easier' games for Newcastle - they've less to play for than some of the other opponents.
"But you have to mention the goal difference of Sunderland - it's minus 18 compared to the other two (seven better than Norwich, eight better than Newcastle). That could be massive."
The race to avoid the drop this season certainly looks to be one that will go right down to the wire.
If goal difference is to prove crucial in the end, the Black Cats will be confident they can come out on top given the dominance they currently enjoy in that regard.
Similarly, they also have striker Jermain Defoe in their side, with his form having been impressive this season and likely to play a big part in the games remaining.