St Johnstone's Nigel Hasselbaink brings Celtic back down to earth with equaliser at Parkhead Within the opening four minutes they had forced two corner kicks, although their sense of adventure came at an early cost when David McCracken sustained a face injury inside the Celtic box and had to be replaced by Gary Millar. Such expansive play might have been written off as precociousness, especially since Celtic had been reinforced by the return of midfielder Scott Brown, the only change from Wednesday - the captain having recovered from the virus that ruled him out of the Champions League match, was back in place of Mikael Lustig. However, the familiar flatness that has followed Celtic's European adventures this season was again in evidence with their legs looking a touch heavy on their forays upfield and more so when they had to track back, which was why Steven MacLean was able to ease past Efe Ambrose to put Hasselbaink clear on the edge of the Hoops box. Had Hasselbaink taken a decent touch he would have found himself in a prime scoring position but he got the ball tangled between his boots and although he squeezed out a pass back into the path of MacLean, his colleague was no more efficient and slashed his finish over the crossbar. The Perth side were also prepared to use brawn, as when Fraser Wright sent Georgios Samaras into the air and was shown the yellow card for the Greek's pains and Chris Millar was also cautioned for fouling Kris Commons before half time. By the interval, St Johnstone had accomplished a feat that had eluded Barca at both the Nou Camp and Celtic Park - they had kept a clean sheet. Lennon identified the most likely source of urgency amongst his replacements and sent Watt out in place of Miku for the restart. The ploy looked inspired within five minutes as the 18 year-old put Celtic in front. Like his winner in midweek, it was a route-one goal, in this instance stemming from a long diagonal high ball from Charlie Mulgrew which Watt bundled across the line although Alan Mannus got a touch in the process. St Johnstone, though, were not cowed and when Gregory Tade replaced David Robertson they began to look increasingly troublesome. Mansager Steve Lomas enlivened the proceedings by getting himself sent to the stand for abusing the officials after Watt had stepped back into play after limping off with an injury. Those left behind in the Perth technical area were further aggrieved when Tade went down on the edge of the box under a challenge from Adam Matthews, which they construed as a penalty kick, but the visitors had the last laugh within moments. Hasselbaink forced a fine save from Fraser Forster, who turned the ball around for a corner kick. From the flag, Millar played the ball short for Dave Mackay to cross deep beyond the back post where Frazer Wright headed back down into the box. Hasselbaink swivelled to shoot home from nine yards, the ultimate effect of which - after a week in which Scottish football overflowed with debate, anxiety and euphoria - was to leave Hibernian alone and two points clear at the top of the table. Celtic (4-4-2): Forster; Matthews, Ambrose (McGeouch 83), Wilson, Mulgrew; Brown, Mulgrew, Ledley (Kayal 70), Commons; Miku (Watt h-t), Samaras. Subs: Zaluska (g), McCourt, Lustig. St Johnstone (4-4-2): Mannus; Mackay, Wright, McCracken (Miller 5), C Davidson; Millar, M Davidson, Robertson (Tade 72), Craig; Hasselbaink (Vine 83), MacLean. Subs: Tuppey (g), Caddis, Tobin, Kane. Booked: Millar, Wright. M Davidson. Referee: I Brines.