Solskjaer suggested Mason Greenwood may also not make it as he returns from illness, while he is waiting to see if Marcus Rashford had any reaction to his return to training on Friday following a shoulder complaint.
Ivanovic and Pereira had both been unavailable for the defeat by Tottenham before the international break, while Robinson has completed his 10-day isolation period after testing positive for the virus while away with the Republic of Ireland.
The Baggies are waiting for the all clear from other players who have returned after international duty. Forward Hal Robson-Kanu (broken arm) has started some group training and midfielder Sam Field (knee) is also stepping up his own rehabilitation.
Manchester United provisional squad: De Gea, Henderson, Grant, Wan-Bissaka, Fosu-Mensah, Lindelof, Maguire, Mengi, Tuanzebe, Telles, Williams, Fred, Fernandes, Matic, McTominay, Pogba, Van De Beek, Lingard, James, Mata, Cavani, Ighalo, Martial, Rashford.
West Brom provisional squad: Johnstone, Furlong, Bartley, Ajayi, Townsend, O'Shea, Livermore, Krovinovic, Gallagher, Robinson, Grant, Button, Ivanovic, Pereira, Gibbs, Peltier, Phillips, Diangana, Sawyers, Edwards.