Manager Tony Pulis was giving his pre-match press conference ahead of the key visit of play-off rivals Bristol City to the Riverside.
Pulis confirmed that both Patrick Bamford and Stewart Downing were carrying slight knocks and would require checking.
Boro suffered a setback in midweek after going down to a 2-1 defeat to Sheffield United at Bramall Lane. Grant Leabitter saw red during the opening half of the contest and is therefore suspended for this weekend.
That reversal witnessed the visitors slipping back outside the play-offs with just four more games remaining.
Those begin against the Robins this weekend, and are followed by further vital meetings with promotion rivals Derby County (A) and Millwall (H) ahead of finishing off the regular season at Ipswich Town early next month.