The Celtic winger James Forrest could do the harm in the derby on Sunday. Former Rangers captain Barry Ferguson looks worried about that.

Forrest was forced to leave last week’s game against Livingston because of back, shoulder, and hamstring stiffness.

After a six-month layoff due to ankle surgery, he’s also on his way back to full speed.

So far this season, Celtic hasn’t been able to rely on Forrest’s services in any of the derbies. All three have been overlooked by him due to the winger being out injured.

Any Celtic fan is crossing their fingers that he will pass a late fitness test and play in the Scottish Cup tomorrow.

Ferguson believes that if he is named to the starting lineup, our rivals will be worried.

The former Ibrox captain said on The Go Radio Football Show last night:

“For me it’s shown how much Celtic have missed him – he’s a top player.

“He can win games but also he does the dirty side brilliantly. When he’s not playing well he’ll give you 100 per cent for the team.

“He’s a real team player and you’ve seen the difference he’s made since he came back into the Celtic team in the last couple of weeks.

“He was really good, it was obviously a worry for John Kennedy when he came off injured but, listen, it’ll be a worry for Rangers if he’s fit to play on Sunday. James Forrest is a top player.”

Forrest’s hunger to get back on track was evident in his goals against Falkirk and Livingston.

If he is ruled out of tomorrow’s match, John Kennedy’s preparations for the match may be dramatically altered. We may see a shift of formation and a new approach to the midfield battle.

Expect to see Forrest broad on the right flank, with Mohamed Elyounoussi on the opposite side, if he is included. Having those two in the starting lineup will demonstrate a true offensive mindset.

Rangers could be in for a long afternoon if they can target the gaps between the centre-halves and full-backs.