Hall was restored to QPR’s starting line-up for their match against Middlesbrough last Friday, but he struggled to cope.
The powerful centre-back was at fault for one of the goals Boro scored in the contest, and he generally found things difficult against Jordan Rhodes.
However, Hasselbaink has defended the former Tottenham Hotspur man, suggesting that he has a very bright future at Loftus Road.
“I was always going to bring Grant in,” Hasselbaink said. “Maybe not for the Middlesbrough match, maybe for the next match, but I was always going to bring him back.
“We believe in him and he is the future at QPR. He didn’t have his best game but that’s how it is.
“I’ll stand by him. He’s a good player and we like him.”
Hall has been in wonderful form for QPR this season, so his poor performance against Middlesbrough was out of character.
The 24-year-old has generally looked like Rangers’ most solid defenders, and his return from injury is a major boost for Hasselbaink’s men.
QPR’s defeat to Boro was their first in four home matches, and it has ended any hopes they had of making the play offs.
The R’s are now in 11th place in the Championship table, with their next match coming against Leeds United on Tuesday evening.