Saracens boss Mark McCall insisted the performances of Will Skelton and Nick Isiekwe against Harlequins have created a selection dilemma for Saturday's European clash with Glasgow.

Skelton was named man of the match for an imposing display headlined by two tries that propelled the champions to a 27-20 Gallagher Premiership victory over Harlequins at London Stadium.

And McCall was equally impressed by the contribution of young England lock Isiekwe ahead of the Champions Cup quarter-final against the Warriors.

Maro Itoje is due to return from knee ligament damage while George Kruis was rested for the capital derby against Quins, leaving Saracens with an abundance of second rows.

"We've got some selection decisions all of a sudden because Nick Isiekwe was magnificent. He called the line-out brilliantly and stole line-outs. He did really, really well," McCall said.

"That's the longest game Will has played for us - 73 minutes. He was magnificent and it was almost as if he decided he'd be the difference in the second half.

"When he carries like that with that type of industry in the opposition 22, he's a tough man to stop. We're chuffed with how he played."

Saracens fell foul of referee JP Doyle on three occasions, the first on the stroke of half-time when Alex Lozowski's kick was judged to have gone out before the clock had run down. Quins scored through Danny Care at the ensuing line-out.

Billy Vunipola had a try disallowed after Doyle partially blocked Chris Robshaw and a David Strettle score was chalked off because of an earlier scuffle between Care and Liam Williams.

"The players were really calm and clear at half-time about what we needed to do better," McCall said.

"There was a big curve ball just before half-time when they scored that try to make it 17-6, but the reaction of the team in the second-half was fantastic.

"There was that curve ball and a couple of disallowed tries and we could have felt sorry for ourselves but we didn't and we became the kind of team we want to be.

"I don't know what happened with the clock just before half-time, but I thought Billy's try was a try. JP Doyle doesn't disrupt Chris Robshaw at all.

"And I don't really know why David Strettle's try was disallowed. It doesn't matter in some respects because we took charge and scored right away."

Harlequins head of rugby Paul Gustard was dismayed by his team's second-half collapse.

"It was a good first 40 minutes, but not even an average second 40. We were almost the worst version of ourselves," Gustard said.

"There was bickering, we got frustrated and our set-piece didn't function. We were clinging on.

"We've got a point and our season isn't defined by Saracens away, but this was frustrating. We were only two or three per cent off."